Doesn't Stan's epiphany feel a bit like they know there are only so many episodes to go and they need to get to it eventually? I like where it seems to be headed, and I love that he didn't simply find Evidence and is now Convinced, but it just feels a bit sudden.

Worth remembering, I guess, that he was suspicious of them before, way back in season 1.

That said, I agree it's a little bit 'needs of the plot' but it still worked for me because it was set up way back when.