Surprised not to see any mention of this one yet. I have no knowledge on the relationship between TJ and him. But assuming it is neutral (or good), why wouldn't he be interested in playing one more year at a B12 school? From his point of view, he is coming off the best year of his career and could play his way into draft consideration.
Some will argue that we should just develop Foster/Conditt, but I think we have to consider how much of a year-to-year environment college hoops has become. Plus, I think there's a chance that he and Foster could thrive together in a frontcourt.
I'm sorry if some see him as an obvious take, but I'd rather add some dialogue to the discussion.