IT is not the point guard on a contending team. In a 7 game series he would be exposed and taken advantage of over and over. I personally like him off the bench, using him for moderately short spurts of energy. When the opposing team begins taking advantage of him defensively, sit him down.
When Smart comes back, I don't care who starts, they should share the minutes, Smarts defense is a valuable weapon, his offense will come along, he's still a 21 year old kid. Remember Bradley when he was 21?