Pacquiao-Sturm: Could Manny Beat Him For His Middleweight Title??

Hypothetically, if Manny could put on the weight without losing much speed, I think of all the middleweight champions, he could possibly beat Sturm. I wouldnt favor him, but I'd give him a decent chace. It sounds crazy, Sturm being a big man and all, but Sturm is very inconsistant. Hes a very good boxer at his best but he often fights his opponents fights. He struggled mightily with 5'8 southpaw Khoren Gevor, who is was really just a mediocre challenger. Plus Sturm isnt a big puncher which would also benefit Manny. I dont see Manny ever moving up to middleweight, but for just for fun how do you see this fight going??