Cotto - brutally: with one caveat. Cotto struggled at the end of his tenure at 140 - this would have to be around the time of the Bailey / Corley fights. Against a weight drained Cotto, Khan would have a shot.
I like Cotto, a lot, but he'd be giving Khan just about every advantage. I've never seen Khan tapped to the body before, though. It would be interesting to see how he'd fare against Cotto's patented body work.
Absolutely this. As much as I like Cotto (not the current ghost of Cotto that still boxes) Khan is an unstoppable wrecking machine at the moment thanks to some creative shakes.
At 140lbs, I definitely favour Cotto. Cotto has trouble with very fast hands, but Khan doesn't have the pop like say Pacquiao. I could see Cotto being able to take shots to get his own off. Cotto working the body to get the finish.