Manny Pacquiao vs. Saul Canelo Alvarez in Mexico, if this push through, who win?

I came across an article that a certain person was offering Manny Pacquiao a $65M purse to fight an opponent most possibly Saul Alvarez in Mexico. a href="http://sports.inquirer.net/4365/mexican-millionaire-offers-pacquiao-65m-to-fight-in-mexico" rel="nofollow"http://sports.inquirer.net/4365/mexican-…/a If this match up push thru, who do you think will win and at what weight it should. Saul Alvarez is a Light Middleweight and Manny is a Welterweight. Both have an experience in fighting in a catchweight. I believed this is not a bad match up although it is just my own opinion.