Okay listen. I was seriously just about to post something about this exact subject.
First i want you to watch this whole video. Observe what Adam does.
Now tell me how his bad play isn't because of confidence. Did you see that like 40 foot three he TOOK, and made. He would never take that in the NBA. Not that i would encourage anyone to shoot that far away BUT, he just doesn't have any confidence to really take any of the shots he was taking in that video. His shot is still with him. People always say how he cant jump any more or whatever so that messes up his shot. No. His shot looks the same as it did in college.
Also, as I am writing this, I saw Adam make a shot like he made in the video I posted. If he can keep doing that, His CONFIDENCE will go up and he will keep shooting those shots and hopefully keep on making those shots. You get what I am saying?