Nunge to Xavier. The Kofi situation is a big deterrent for any guys looking for assured roles. I would think you could safely scratch Robbins off the list
Robbins is in demand. No ego kid. Will want to be the starting center for sure, however.
Kofi will need to get a lot of feedback from NBA guys and that is still no sure thing they even know what might happen.
I have seen his name from late first round to undrafted. I don't think his draft status changes by staying another year in college unless he shows a big expansion of his game which is hard to do at this level.
He needs to work on his game FT for a living and he is not afraid of the work.