But...Byleth wasn't unemotive because they were a mercenary, they were unemotive because of the fact Sothis hadn't woken up. Like I said, you're injecting a negative viewpoint where there isn't any.

As much as people would LIKE for it to be Crimson Flower is NOT a villain route, as villain routes usually have you as the bad guy. The villainous actions are addressed. Instead you're potrayed about as much (if slightly less with the whole conquest thing) of a hero as the other routes, complete with the Black Eagles becoming the underdog and being short on troops, and Edelgard fighting directly on the frontlines. Sure we can call it the villain route since Edelgards the villain in all the other routes, but it isn't played as if it were one. There's no "Look at the horrible thing you've done!" or "Edelgard's empire crumbled and she was killed in a coup after TWSITD were defeated". or even a "Edelgard's lies get exposed' moment. She's just potrayed as the hero the entire time.

Also, Edelgard doesn't think Byleth is completely without emotion, she thinks byleth is DETATCHED. As in, not showing emotion often. She also agreess if Byleth says that Edelgard is also detached. That entire part of the conversation is brought on because Byleth says they are jealous. The entire thing of "Edelgard thinks Byleth has no emotions" is from a conversation in which Edelgard is GLAD that Byleth os showing emotion.

"I'll admit, I think of you as rather detached, so to hear that you have emotions such as jealousy is... something of a relief."

Also I forgot to ask...where is it STATED or SAID that Byleth WANTS to be a guiding hand for Fodlann? Like I'm not sure where that came from since it's not as if Byleth actively pursues a position of power, it's usually something they just sort of get given at the end of the other routes since Rhea either gives them said position, or is dead and Byleth ends up filling that role

Imma ask this: if being a mercenary was completely fine, if that had absolutely no negative impact whatsoever on Byleth... why didn't Sothis wake up earlier? Why did she only do so right before the lords - who give Byleth the chance to grow - meet with them? If they don't want to be a guiding hand in Fodlan, why don't they reject the leadership position given to them - especially on AM, when Rhea and/or Seteth could take over as archbishop?

It's because being a regular mercenary isn't good for them. It's because there's a consistent theme with Byleth that leadership as well as the Church are good things for their character, as well as for Fodlan - it's in the routes the Church is standing and Byleth earns a leadership position that Fodlan is at its most peaceful in the endings. It's not me being negative when it's this consistent within the game itself that being a leader and having a purpose beyond being a sword hand is what is best for Byleth.

To give the short answer to the "CF isn't a villain route" idea, here's this post I made detailing many of the ways CF is by far the most morally bankrupt route of the four of them, regardless of surface level framing. CF isn't a villain route in that "oh ho look at you, being evil!" It's the villain route because you are actively helping the villain get what she wants. You are the reason Fodlan falls into tyranny. It's your fault, as the player, that Fodlan is engulfed in war again when that isn't necessary in the other routes (where TWS are just taken care of with no need for a "long, arduous, bloody war"). It's because of you that the people of Fodlan must live under Edelgard's cruel leadership, being spied on by the secret police and having any rebellion they try to muster be put down in secret by Edelgard's evil butler.

You say CF isn't the villain route because Edelgard's villainous actions aren't addressed, but I'm sorry, I have to disagree with you with what qualifies as a villain route. You help plunge the continent into war by backing an imperialistic warmonger. You help spread outright lies about the Church. You keep up these lies even to your friends and let them believe the Church just nuked Arianrhod, without ever setting it straight with them. You work with a murder cult hellbent on killing as many people as they can. You comply with someone who is keeping an independent country (Brigid) under her thumb by keeping Petra as a hostage, which she herself refers to herself as on CF. You use Demonic Beasts as "war assets." You invade a neutral nation that's kept out of the war entirely. You help try to finish a genocide against the Nabateans - or, at best, work with someone who wants to finish it. You are the villain.

CF has you as the underdog despite it always being the one with the advantage in the beginning of the war phase because it is deliberately breaking from the worldbuilding of 3H, as said by the developers. Byleth is supposed to stand against Edelgard, not walk with her, hence the warping of the story when they do. It doesn't have to directly, explicitly say it's the villain route for it to be clear that you are not the good guy here.

Like, "you're portrayed about as much (if slightly less with the whole conquest thing) as much as a hero as the other routes-" no! Not slightly less! That is in large part what makes it villainous! You aren't fighting to defend yourself and to take down the one who plunged Fodlan into war - you are the conqueror! You are the one doing the plunging! For completely selfish gains, at that! There's no explicit "wow bitch you fucked up here" because the sign of you fucking up is the state your actions leave Fodlan in. It's Byleth losing the Crest Stone and going back to the beginning of their character arc. Edelgard, the villain, won - she got to have her happy ending on the graves of countless innocents lives she deemed less worthy than her ambitions, and it's all because of you. Edelgard getting exposed and her empire crumbling down is a good thing, which CF is not. You don't get to have Edelgard face the consequences of her actions like you do on the other routes where she dies, because she won. The bad guy won. You helped the bad guy win, so no, you aren't going to get the satisfaction of watching Edelgard fall - you play the other non-villain routes for that to happen. Why should there be? This is what you as the player wanted! You chose to side with Edelgard, even after being shown her involvement with nearly every bad thing that happens in WC, because you wanted her to win! You’ve reapt what you’ve sown!

And imma just ask... why is Edelgard relieved to hear Byleth has emotions such as jealousy? And why does she insist that Byleth is detached if you try to deny it? Why does Byleth have to directly tell Edelgard about them feeling emotions for her to know it - why doesn't she just know already? You never hear this sort of doubt come from Seteth, Claude, or Dimitri on SS, VW, and AM - hell, Claude will even outright say that Byleth has gotten far more expressive lately during tea time conversation! Why is Byleth detached in CF - why aren't they closer to the lord? Why is the lord doubting the connection between Byleth and others in their A support? Why is it only on CF that Byleth is ever called detached during post ts? Why is Byleth not showing emotion often? Enough to make Edelgard question whether they have emotions? 

It’s because Byleth is regressing on the progress they’ve made in being able to emote - they act in ways that are similar to how they act in the beginning of the game because CF is a negative influence on their character. Edelgard calling herself detached like Byleth is not a good thing - Edelgard’s detachment from other people is what lets her sacrifice innocent civilians for her goals. It’s what let’s her believe that her imperialistic dreams are worth the bloody path needed to make them come true. She is not connected to those around her, hence her being able to justify killing anyone to get what she wants, up to and including her Black Eagle classmates (Bernadetta on Gronder). Byleth being compared to someone like that is far from a positive thing, especially when all other routes have them have that connection with others and all other routes having a more positive, peaceful ending for Fodlan than CF. 

I will say though, it seems as though Byleth never seems to explicitly say that they want to be a guiding hand - that's a fuck up on my end and I apologize for that! But it's almost undeniable that that is the intended good path for them, versus CF where they don't have that happen. In the ending cutscenes of AM, SS, and VW, Byleth and the lord of that route (+ Rhea for SS) are bathed in the light (with Rhea being able to live on SS if she is close enough with Byleth), and Edelgard dies in the light. In CF, Byleth and the lord of the route are shrouded in darkness, with only the flames of destruction lighting them, and it's this setting that Rhea dies in. Edelgard can't survive in the light, and Rhea can't survive in the dark - and then the endings that correspond with these two scenarios match as well. The endings where Edelgard dies in the light and Byleth rises to become a guiding hand for Fodlan are the ones where peace is achieved, and the one where Rhea dies in the darkness (the one time Rhea always dies, unlike SS) is the one where Fodlan is fucked.