Hevlaska's Innocence being like Timothy's? Hmm... there's no sign that hers includes a separate spirit, if that's what you mean, but I guess it's possible. (Annoying? I like the guy better than Timothy himself!)
Oh yeah... the level 4 has machine gun arms. What the heck? Not that he's posing a threat to most of the Exorcists there, just Marie and Link... and Emilia, if she got close enough... Still, that's two or three Accomodators who aren't going to feel the punch, so maybe that's why Hoshino gave it this ability for the arc.
Yeah, some of the characters did look a little different (Allen, for one). It'd be great to see how some of the other ones have changed, though (...LENALEE).
Makes sense, the supervision reason. But why wouldn't they trust Reever? Is it a case of "we watch everyone"? But the Exorcist team only had Link, and as far as we know, he was just there for Allen. What could/would Reever do that requires two guards on someone who isn't a known threat? (Unless he IS...)