Fact is, he's going to get hammered by the KGs of the league whenever he runs into them. Whether it happens when he's older or younger doesn't change much, aside from how quickly he develops. Every player who came into the league young, from Kobe on, has gotten hammered by superstar vets, but it has usually helped their development, not harmed it. I remember watching this in action last year, when Justin would play against people like Tim Duncan. He started off getting tricked left and right, but you could watch him improve right before your eyes. Every time he got burned, he played a little smarter the next time around.
That's what Hawes needs right now. He doesn't need to sit on the bench until he gets older and has more emotional maturity. He got through college ball by being more skilled than average, and several inches taller than everyone else. To become better, he needs NBA level competition. Guys who are just as big as him, and much more experienced. He's not some delicate little flower whose ego is going to be scarred for life by playing against someone who is better than he is. He already knows that they're better. He just needs a chance to learn and catch up.