I can't believe anyone would think this was intentional. You clearly see the glove of Tony caught up with Edwins glove and Ed was moving to the right and leaning slightly forward and met full force with Tony's elbow. It was no one's fault but Ed got the short end of the stick.
That happened because Valero tried to stop DeMarco's punch and DeMarco's arm bent and his Valero's head. DeMarco was professional. It may sound dirty that after that elbow he went after Valero but the ref didn't say stop punching so what he did was legit.
In slow-mo it looks strange but when you watch it in real time its obvious that it was a complete accident. Also I thought he was quitting there at the end but it WAS his coach saying he was going to stop it and DeMarco was saying no...no, he would have continued even with a broken will to win, he told his coach no dont stop it, watch again..
That might be the 2nd worst case of pot/kettle I've seen on ESB. In essence what you are trying to convince everybody of is that DeMarco, during the act of punching, has his glove hit by Valero's glove. In the smallest fraction of a second, he decides to alter his punch and instead use his elbow, all along knowing that Valero's head will move to the right(DeMarco's left), so that elbow and forehead meet in a bloody, serendipitous mess. Do you realize how thoroughly, utterly ridiculous that sounds?