To add to this - LSU doesn't seem to fit the academic profile Dji seemed to go towards. Originally committed to Wake, then came here, also see Princeton and Rice on his old recruiting lists.
Also if it's mostly about making the tourney, I think he'd have better options than LSU.
But, if it's more about increasing professional basketball chances (which I suspect it is) then LSU probably makes a lot of sense. Less likely to get recruited over than going to a perennial top 15 team but still get to play at the highest level of college basketball and probably log pretty big minutes. And I'm sure a nice paycheck to go along with it.
I'm not counting on it, but still hopeful he comes back to finish what he started here. Loved his game, demeanor, leadership, etc. and he will be a huge asset to whoever he plays for next year.