Coaches want a scorer, a reserve forward to bring in a few more fouls, and, perhaps another point guard for a breather in down moments during a game. Syracuse uses DeShaun Williams as a designated shooter off the bench. There's so much rest in a game now. It's not a factor. We're essentially playing five guys right now.
Most teams only play two or three bench guys.
You need three guys who can consistently score and the rest to fill in. The ultimate depth is to have 10 players, one backup at each position. But Boeheim is satisfied with a forward, a guard and another player to play the post. He has Preston Shumpert and DeShaun Williams to score to fill his needs. Both could be starters if he had to insert them.