Agreed. but I would not rule out this happening in Rd. 1 or 2....
I think much of Rd 1 and 2 will be spent with BJ picking apart Sanchez on the feet, much like he did to Sean Sherk.
Eventually Sanchez will shoot, Penn will sprawl, take it up against the cage and throw/take it to the mat. Sanchez gives up the back, Penn puts the meat hooks in and......VOILA!!! CTFO!! ;D