Do you think Cain Velasquez will be good enough?

Size is not issue there professional fighters they use techniques against size. Anyway Cain Velasquez has never been taken down in MMA yet, he is a very superior wrestler. Cain has some good stand up, as displayed at UFC 110, against Big Nog. Brock Lesnar's stand up has a lot to be desired and if Cain can stop the takedown, Cain will certainly win. You say is he big and strong enough, wrestling is not about that, its about using technique and using center of gravity to take people down not strength and size. Since Brock weighs so much his center of gravity has so much weight on each side of his center that if you lifted him a little bit he will fall HARD! I think Cain has what it takes to beat Brock, but who knows.