About Genji, my point exactly. How can you possibly know that that's a mistake and not a clue?
For example, maybe the Beatrice at the end is not the "Beatrice" behind the spider's web and the fake Kanon. Or else, maybe there's no need for Genji to obey Beatrice until her resurrection ceremony is complete (which is the time he switches over). Or, it could be that either the final scene or the previous scenes have a lie in it, either because "Genji" wasn't Genji in one of them, or because the entire scene is somehow bogus. Or, you could argue that Genji is an opportunist and only switched to Beatrice's side after it's clear she's won (if you believe in anti-fantasy).
So yeah, I think I've made my point
It's literally impossible for you to make the argument that his behavior is out of character until we've seen the end of the series.
While finding errors in the anime isn't so hard, you'd better have a hell of an argument before trying to find an error in the VN. That's what Ryuukishi's best at.
Also, if you think not giving up when dozens of goat monsters are chasing you
isn't perseverance, I don't know what is. It's not like Rosa had any chance of beating them all.
It sounds like you define "perseverance" as not giving up no matter what happens to you, even after being forced to eat your siblings and seeing your daughter like that.
Come on, seriously?