Broken shooting mechanics are not something that is easy to fix. Gordon has trouble hitting anything outside of 3 feet. Great defenders that can not shoot or have offensive games much beyond a dunk can be found in the second round of most drafts. I don't see wasting a top ten pick on someone who projects out to be a role playing defender.
This is my pet peeve. I understand that better mechanics lead to better shots, but I'd still really rather be comfortable and just practice, practice, practice and practice. Does not matter if my elbows are tight or my feet are set, if I settle in a form where I'm comfortable, that should be it, and just keep shooting.
I really believe that these guys, when they shoot, are more worried about getting their mechanics right than actually focusing on hitting a shot. Shawn Marion has the WEIRDEST shot but did not prevent him from being a decent to good shooter. Kevin Martin's form isnt pretty either, but he's hitting shots. Marcus Camby had a decent mid range game in his prime, and he whirls the ball around in his head.
If I'm the Celtics, and will draft Gordon with the idea of improving his jumper, I'd let him shoot in a way he's really comfortable, screw mechanics. But I'll let him shoot A LOT, maybe about 500 a day. He'll improve that way IMO, muscle memory works that way too, but, he's focused on making the shot instead of focusing on his form and mechanics.
Just me.