I believe he needs 50+1% of GOP delegate voters to get the nomination... unless my math is terribly wrong.
He can arrive at the convention with fewer delegates than needed, and wrestle them out of the competition in under an hour. You have to know that. Do you think a tyro like Cain could stop him? What if the primaries result in, roughly, 40-20-15-15-10? He could take that majority he needs, with a phone call.
I do not understand how anyone here cannot read the writing on the wall.