What do YOU think the reason is?
To me its simple: his talent potential falls slightly short to his ego/attitude (whatever you want to call it). Sprinkle in the fact that he has the body/frame of a 15yr old boy, and that doesnt help his case either.
Lastly, lets stop this nonsense about Rosen being somehow cast away like he was drafted in the 3rd round. HE WAS STILL DRAFTED IN THE TOP 10. Rosen wasnt Luck coming out of Stanford. If the bundle of twigs cant realize that, then that itself is part of the problem with him.
I cant wait until Toothpick Rosen gets annihilated by Suh and Donald 2x a year.