It is collectively agreed upon that Margarito was using loaded gloves. With this in mind we look at Kermit Cintron's track record. 33-4-1 2 of those loses came to Margarito (questionable) 1 of those to Williams. Should have been a NC. The tie should have been a loss. (to Martinez) and then Molina who won (and then got shafted on his next fight and is the one who should really be fighting Alvarez. His record could read 35-2. As someone stated in the Alvarez/Cintron thread. You just don't know which version of him will show up. BUT as a what if scenario - IF he beat Alvarez (which gives him a title) AND then Margarito beat Cotto (giving him a title) the 2 re-matched for a third time in a unification match... That would be a twist in boxing.
I agree the losses to Margarito are questionable. I never considered Margarito a skilled fighter and was confused by the success that he had with Cintron. That said, Cintron has shown many signs he is a head case and as you stated inconsistant. Alvarez has shown to be very steady and mentally strong and that quality is why I pick him to pull through in this fight.
