I think we sometimes forget that Glen Davis was a second round draft choice for a good reason. We (the Celtics) have managed to maximize his talents, help him lose weight and develop a moderate midrange shot.
He is still undersized (in length), not very athletic and has a young BBIQ. The guy has a huge heart and plays above his head a lot IMO. He usually give us 110% effort. He has been a Hero for us countless times and Goat just as often.
I love watching him play, but I have always thought we were overrating him everytime we called him a starter. He is at his best as a role player and he should always be a bench player except in these extreme circumstances of injury.
To ask him to do more than be a role player or let him believe he should have a bigger role is a path to disapointment for everyone and unfair to him.