We are quickly venturing into worst case scenario territory but should still be pretty good barring an unmitigated disaster.
Dotson/Moore/Grimes
Grimes/Moore/Garrett
Garrett/Grimes/KJ
KJ/Dedric/Mitch
Dedric/McCormack
Deep Bench: Cunliffe/Agbaji
Pretty flexible too, the only guys I'd lock into a position are Dotson and McCormack. Dotson mainly because I would slate him as the only true PG on the roster, though Moore and Grimes are solid combo options. McCormack because he has a center skill set, is huge and all the other bigs on the roster are capable of playing the 4. Dedric will be playing a lot of center in this scenario.
I think Moore is the primary back-up guard at this point unfortunately. I could even see him starting early on because Self.
Mitch going from a possible RS to likely 3rd big. Pretty crazy.
This rotation is probably good enough to win #15. Shooting is a huge concern and there are so many relative unknowns though.
The one thing is this situation represents THREE open scholarships. If Self can avoid that he will.