If they rematch i just see it being similar to Pavlik - Taylor 2, with Cotto trying to survive an a close fight. That's about as good as i see it getting for Cotto. I'd give him practically 10% chance, at best of beating Tony.
On the other hand, there's a chance that Cotto won't be mentally strong enough to take punishment for anywhere near 11 rounds. So yeah it could be over even quicker.
I just see Tony winning everytime to be honest. I think Cotto is better in most aspects (especially technical) but Margario's will is awesome.
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