As down as everyone is on Bennett, he is one of those guys that just needs to mature and become more confident as a player. You can tell he isn't playing with confidence lately, look at how he catches the ball with his body and looks stiff out there.
Dude was making plays in training camp, leaping one handed snags, pancake blocks, almost uncoverable in the redzone. Its just a matter of time before that translates on the field.
With a guy like this, with Bennett's personality, you gotta be patient and let him develop.
Hopefully he takes the time to learn from Witten, because he is watching one of the greatest TEs to ever play the game. And he is much more physically impressive in every aspect than Witten, so hopefully if he can figure out how to practice and work like Jason - he will be an absolute monster.
Until then, he's just that really talented kid that doesn't take his talent or the game serious enough.