So basically you have no actual proof that DSOD didn’t hurt Arc-V, even though Occam’s Razor suggests it did. But because you hate Arc-V/shill so hard for Vrains you present it as fact.

No, I made an observation that there's literally no staff overlap like there was with Bonds Beyond Time which has a better argument of why the second half of 5D's was such a bizarre show with rather flippant writing choices of the movie causing problems for 5D's, as the director and writer for that movie were Katsumi Ono and Yoshida Shin, the top people for 5D's, so much so that for 2 months worth of episodes, Mr. Ono had to step away (which led to Crashtown)

DSOD had no meaningful staff overlap, and basically the problems everyone criticizing the show on just merits and complaints derives from writing choices made in episodes written by Kamishiro Tsutomu, who can be observed as having written only for one show since ARC-V's airing, and apparently is now writing for manga under a psuedonym.

That speaks to the observation, with Occam's Razor, that Kamishiro Tsutomu sucked at his job, was essentially blacklisted from his profession as a result of the fall out of ARC-V being such a contentious entry to put it mildly that one can infer that the industry doesn't want to hire a person who nearly Hindenberg'd one of the major cash cow franchises in Japan.

"Entities should not be multiplied beyond necessity", it's easier to explain the show falling apart because the Series Composition role was headed by a guy who did a bad job, rather than funding vampirism from DSOD. As DSOD was more than likely in development during the back end of ZEXAL too, and ZEXAL didn't fall apart.

Please explain to me how DSOD, which has a completely separate staff structure, made Mr. Kamishiro Tsutomu write such gems as "Sergey gets beaten to death with pipes after a tragic noble end vs Jack", "Yuya pisses his pants at his dragons", "Let's negate Ruri's agency at defying her own brainwashing" "Let's not have Yuya defeat his own personal demon controlling him and it gets resolved by a non-entity with barely any personality who basically negates all the work of the rest of the cast", "Yuzu teleports the plot away so I don't have to explain my one note mystery box" and other winners and gems like that.