Many of the Perrywinkles are too blind to see that few of us see a nice-haired RINO named Perry as any improvement over a nice-haired RINO named Romney. So we can't get too excited about your pure speculation that Cain is a stalking horse for Mitt.
Even if true, the stalking horse is running well ahead of him. I'd much rather have Romney at the bottom of the ticket than him or his ideological twin Perry at the top.