Smart has been quoted as saying he came back to improve his perimeter shooting. He did that in the non-conference games. In eight Big 12 games he is shooting 34.6% from the floor and 22% from beyond the arc. OUCH!
His poor shooting and his antics on the floor can't possibly improve his draft stock in (as you correctly pointed out) a much deeper draft than last year. He'll still go in the first round. But one has to ask, is he really ready or would coming back for another year be a wise decision?