Evans is for sure on the staff.
I've said this elsewhere, but coaches are fiercely loyal to their assistants who helped them get where they are. We are lucky that Underwood is open to hiring Walker. The odds of him getting rid of two of his assistants is small, IMO. I would guess a staff of Evans, Walker and Boynton.
I wouldn't be surprised if the third assistant from OSU is offered a job in some capacity unless he has something else.
I would typically agree with that but two of Underwood's assistants at OSU were in their first year on his coaching staff. Not really a long partnership between Underwood and anyone except Boyton.
Evans does have ties to Underwood as they were both under Frank Martin but that doesn't really mean they have a close connection. Evans would actually be a pretty good fit at FSU to replace Gates if Gates were to come to UI. Evans has pretty strong ties to Florida. He grew up there and went to JC there.