@Who
David Lee did not pad his stats against lower level competition. He can rebound with the best of them. He gives a lot on the offense, he can post, shoot midrange, pick and roll/pop, crash the boards that other starting PF don't do.
I agree, defense is a concern, which is why he has Bogut (here and in real life) to help him out. But to say that what he can do on offense will limited if he's a starter is (with all due respect Who) is absurd. These stats, he had while starting, against low and high level competition. He's been consistent.
David Lee is not a below average PF. He can do more than Blake Grifin and Serge Ibaka could (yeah I said it) and some consider them top 10 fowards.
For what he produces, if it's better for him to be off the bench then there better be someone who produces more to start over him.