Some guys are not meant for college or the college experience. He now doesn't need to worry about money or the class room or fitting in. He can be all basketball and nothing else. I know the Rockets liked him, but other teams were turned by his personality... Which is too bad.
The fun thing is that with each Pistons loss, Detroit is closer to just going full youth movement and ramping up Drummond's minutes to 30+ per game. During Greg Monroe's rookie season, this happened around the 30 game mark. Expect to get some long looks at Drummond in the last half of the season once that happens.
