would Bush be better used as a WR like Steve Smith

I keep wondering myself why they have not tried to throw deep to him. Does anybody know why they would not try some deeper routes with him? Shoot, at USC he used to run deep routes all the time and scored alot doing that. Whoever is covering him on the opposing defense cannot cover him. He would have been the number 1 reciever drafted if he played that position. I don't see the mismatches that everybody talks about when they talk about using Bush in the passing game. Supposedly, he is suppose to get matched up on a linebacker or safety and burn thier butt. The problem is, I don't see him matched up on these people. Is that because defenses are doing a great job with who they put on him? He can run deep routes as good as any reciever. I do not know why they don't use him that way every once in awhile.