Nah kill Endeavor midway and introduce new hero to take his role as the hero with new relevant story as No 1 like happened with Hawks and last minute additions like Star Stripe. Because Endeavor remains the only morally bad hero who is an example of what hero should not do in personal life using his job as a cover as Stain warned. His treatment of Inasa, taking on petty cases to increase numbers and being dumber than Iida who cracked the pattern faster magnified his behaviour as a shoddy hero driven by envy and prejudice and personal desires and not enough to call it justice as the subjective praisevsays about his heroics by people who have a personal reason to believe he was good as a hero and not disbelive it even in face of proof. His atonement didn't actually have narrative significance in the end either. If he was pulled out of their story, already Deku then Shoto then self-effort from hidden strength from hope due to Shoto alone was enough. He couldn't give them any actual closure or help. Endeavor in short had little to no big role other than being the cause of this apocalypse from a single video because he took the No 1 spot by default despite being wrong for it. The effect of the video was more positive in the long run by freeing them and making their stories valid by Endeavor's televised confession than how bad Toga or Gentle's families had it from being associated while Shoto seem happier having shared with all. They are also valid for unconditionally loving their son instead of being conflicted by his crimes which is Endeavor's fault to them as Shoto's thoughts went. Overall Endeavor's role is simply as the abuser who prevents his victims from taking heat and criticism from his fans by confessing because they all push him including Hawks and it is possible because the hero association are dead and won't issue a cover up to protect their overall image. But this confession could still be exposed in other ways using new characters or existing information technology known with Garaki Kyuudai had Hori wanted while keeping Endeavor bad which would have resulted in a better catharsis than leaving him sticking on to his victims.

Ok so another long break down.

Nah kill Endeavor midway and introduce new hero to take his role as the hero with new relevant story as No 1 like happened with Hawks and last minute additions like Star Stripe. Because Endeavor remains the only morally bad hero who is an example of what hero should not do in personal life using his job as a cover as Stain warned.

Killing Enji this way only works if the story becomes fully about Hero corruption, which it just isn't. All of the Heroes which had questionable attitudes toward Heroics changed their ways, or besides Enji just weren't that bad to begin with. Even if we leave Enji as a truly bad guy, he's one out dozens we see who are all good, so it doesn't even help prove the corruption angle much. Could this work--sure, but it'd change the story and it's themes drastically from what Hori's intentions seem to be--at that point it's not even his story.

On top of that we get no evidence Enji is using his job as a Hero as cover. Nor did Stain ever say anything about Heroes using their job to hide actual crimes. I love the guy, but all he cared about was people being Heroes that weren't 100% selfless. On top of that he just didn't even seem to check the Heroes he hunted out first, since we have no evidence Tensei was anything other then a great Hero who cared a lot about saving people. Stain didn't know about Enji's abuse and just hated him because he wasn't All Might.

His treatment of Inasa, taking on petty cases to increase numbers and being dumber than Iida who cracked the pattern faster magnified his behaviour as a shoddy hero driven by envy and prejudice and personal desires and not enough to call it justice as the subjective praisevsays about his heroics by people who have a personal reason to believe he was good as a hero and not disbelive it even in face of proof.

But Enji did crack Stain's pattern--that's why he and Shoto we in the city at all that night. He tells Shoto about it when they leave for Hosu. Shoto even says he only picks Enji's agency because he's a great at his job and despite his hate for him at that point, it'd be stupid to turn down learning from one of the best in the industry.

Enji never shows prejudice in the manga. The spin off made him OOC so he could function as a side antagonist for the later arc in the story, but in the main story he never acts that way. No, he was never great to fans because having fans was never his reason for being a Hero and he didn't understand how important it was to inspire people until he became #1.

I assume what you mean by disbelieving proof, you're talking about Touya's video during the first War. Honestly, people not believing Touya makes perfect sense in context. Enji was never super popular, but when a villain who has killed multiple people and is currently responsible for a major terrorist attack effecting dozens cities suddenly releases a video saying "Hey, this guy trying to stop me from killing everyone is actually bad, trust me, and therefore you should hate everyone who has the same job." it is hard to believe. Plus, people did did believe it, they just were more concerned about Enji failing to stop a massive terrorist attack that probably resulted in hundreds of casualties and displaced thousands of people, then the fact he abused his family--something that in the moment is nothing compared to all the lives lost.

Endeavor in short had little to no big role other than being the cause of this apocalypse from a single video because he took the No 1 spot by default despite being wrong for it.

Enji didn't cause the apocalypse, Shigaraki and the LoV did. Sure, Touya's video didn't help, but because it came out after most of the major damage was done it didn't have as much effect as it could have had if it had been released right after Enji got the #1 spot. People would have been angry at the Heroes and Enji anyway because so many people died and the LoV wasn't captured.

The effect of the video was more positive in the long run by freeing them and making their stories valid by Endeavor's televised confession than how bad Toga or Gentle's families had it from being associated while Shoto seem happier having shared with all.

We don't actually see the family show any positive emotions toward the video. In fact we see them having to hide from the public because they're now blamed for Touya's murders. Shoto can't even go and be with his friends when Izuku walks into U.A, and instead has to hang back with Enji who, I assume had to go in a back way due to all of the hate they were getting because of Touya's video. Shoto might not be upset with his friends knowing, but he was never super quite about his abuse either, given he spilled the beans to Izuku as quick as possible during the sports festival. We don't see if the rest of the family feels similarly at all.

They are also valid for unconditionally loving their son instead of being conflicted by his crimes which is Endeavor's fault to them as Shoto's thoughts went.

But they don't see Touya's crimes as Dabi as 100% Enji's fault. Shoto tells him it was wrong of him to involve other people. Natsuo tells him to stop and that he's being an idiot big brother. Fuyumi just doesn't want him to kill their mom and dad. Even when Shoto thinks "he is me" that implies he does consider Touya's actions his own, since Shoto always held himself responsible for his own poor choices, like being rude to Inasa. Just because they still love Touya doesn't mean they don't hold him responsible for his actions. Enji is at fault, yes, but at the end of the day Touya still decided to murder random people to fulfill his own plans of revenge.

Overall Endeavor's role is simply as the abuser who prevents his victims from taking heat and criticism from his fans by confessing because they all push him including Hawks and it is possible because the hero association are dead and won't issue a cover up to protect their overall image.

The family isn't getting shit on by Enji's fans though, nor does Enji admitting the video is true suddenly make people 100% fine with the other Todoroki's. People didn't hate on the family because they saw them as lying about the abuse because they love Enji to much--they were mad because they view them as extensions of Touya, who killed their loved ones and destroyed their homes. They also don't have to push Enji to do the press conference or admit his abuse. They push him to stay a Hero and help them stop/save Touya. That's why even after he admits to the abuse, Shoto is still shunned.

We also have zero evidence to suggest the Hero Commission ever covered up the abuse. Especially since Shoto has no problem telling Izuku about it.

But this confession could still be exposed in other ways using new characters or existing information technology known with Garaki Kyuudai had Hori wanted while keeping Endeavor bad which would have resulted in a better catharsis than leaving him sticking on to his victims.

Again, this only works if you fundamentally change the story Hori is trying to tell. He wants Enji to change and be a better person. You can not agree with that choice, but if we're taking about stuff an author could have done better you have to try and stick to what they want the story to be. We still don't know 100% what Hori is trying to say because the ending hasn't come out yet, but so far Enji atoning seems to be a big part of the overall message of the story. If that is the case you have to try and find fixes that stick with that vision, otherwise you're just writing your own story, not just making editing suggestions to make the current work better.