Thompson can also play PF, and G. Williams shouldn’t see any center minutes at all.
I don't like playing guys who can't shoot at PF, especially when the 5 is Theis, who can shoot but is super reluctant.
Also, whether it should happen or not, Grant Williams is going to get minutes at the 5. Happened last year and I'm sure it'll happen some more this year, even if only a few minutes at a time.