I think that depends on whether we get a grad transfer (Holyfield). Reason I say that is Underwood will put his 5 best guys on the court, and I'm skeptical we'll have the depth to go with a really deep rotation. So to me, you're looking at the roster and thinking who's got passable size, experience, and if not in that group of best 5, close enough to get slotted there. So IMO, you're looking at a battle between Kipper and Tevian. Kipper should have the edge, but that's a wide-open battle IMO.
Kofi is a physical beast who has potential to dominate in the paint, but the way we run our offense, the majority of the time, your center is up at the FT line, looking to hand off or pass, or take the jumper. Giorgi was mostly passing the ball, and of those passes, he often did the hand off and was effectively just providing a screen. I can't see Kofi being trusted with that same job until he can take care of the ball, see the court, make good decisions, pass effectively, and have the conditioning to get down the court on defense. I think Samba is more likely to get the back-up 5, and Kofi gets spot minutes as he develops. Could be wrong, but that's my sense of it today.
I will add this: Giorgi is exceptional. Giorgi made the center position look easy, when it's not. Underwood needs vision, good decisions, passing ability, shooting from close-in, hustle and conditioning, as well as handling a center-piece that defends the basket and keeps opposing players away from good post position. Giorgi did an awful lot of that and will get better. We really lucked out, and he's going to be our best option there next year. We need the depth so we have more options and potential mismatches, but he should be the main guy there.