As of right now, I'd guess the starting lineup is Bowen, Perkins, Patrick, Payton and Krikke. Payton will be asked to put on 5-10 lbs of muscle this offseason so he can guard opposing 4s better when they post up (which is fairly rare in modern basketball). If Dembele is ready day 1 maybe Patrick comes off the bench, but I'm guessing this will be the lineup that is rolled out in November barring another addition such as BJ Mack.
Folks forget, but Patrick was Iowa's second leading scorer prior to the 2 games right before the mental health pause. He was IMO the biggest reason Iowa won that Clemson game and he also kept Iowa in the Wisconsin game and forced OT. So in order for him to be a starter, all he has to do is get back to where he was at last November & December. It's his senior year, I'm expecting him to surprise some people.