I don't get why people are jumping over Nelson, it's more than conceivable that D-Ham could spend some time at the four against certain opponents, especially if Brimah becomes the type of dominant defensive player we think he'll be.
Assuming Daniels leaves, look at what we have at the four - Facey, Nolan, Lubin. Lubin's a three star recruit who may or may not contribute anything next year, Nolan has played the five almost exclusively in his time here, and Facey, while he's shown flashes, is still a question mark.
I'm not saying the kid is going to start at the four and play 25 minutes there, but Ollie definitely seems to be a guy plugged in to the new-age, position-less lineups school of thought.