I'm sure IT is trying to make a case in CBS's eyes to start. Two things bother me on the subject of IT starting.
First is his defense, mostly because of his size, is certainly questionable. Everyone can shoot over him, post him up, or run him into a high screens and just loose him. If you extend his minutes against the opposing teams starters, it's sure to be a weakness that is exploited, and planned for. They'll plan to make IT play defense.
Also, wear and tear... as the season moves on it will take a toll on his 5-8" 170 lb. frame. The C's will have no real spark off the bench.
While IT coming off the bench is more unpredictable, he's fresh and rested, in attack mode, against the opposing teams second unit, or tired starting defense. He can change the flow of the game putting the opposing team on their heals.
I like him in short spurts, during the game. As soon as he enters, the opposing team has to make adjustments on the fly, not as easy as planning for his game as a starter.