1. They ask Demar to do those thing because thats an absolute requirement and he couldn't. You don't want to admit that DD is not a complete player fine, thats you, but the people that matter, his coaches, know what hew needs and if this makes him unhappy, thats fine too, he'll be easy enough to trade or let walk if he refuses to improve.
2. Andrea Bargnani
is a poor rebounder. After that the guy is an elite player in his position. The sooner some people learn this the better. The criticism he gets from people that don't take the time to truly examine whats going on on the floor is ridiculous.