Heard Eric Piatkowski on the radio the other day. He said he's asked assistant coaches multiple times at practices if Diaz can dunk. They told him they ask him that every single day at practice, the kid just doesn't have the fire. He went on to say if someone could light a fire under Diaz, he would have every NBA scout drooling - he said Diaz may be about the most skilled 6'11" player he's ever seen... wouldn't millions of dollars motivate you to flush a few???
As for the other big guys - they don't even jump. Watching Ubel is extremely frustrating, he finishes like a girl. Jumps just enough to barely get his toes off the ground. Why is a coach not drilling these guys all practice long, making them get off the ground. They rebound the same way (see: McCray, Walker and occasionally Jeter outrebounding the almost-7-footers every single game).