Diaz is stylistically winnable for Gatti, but I believe he is still too good. Diaz outlands him in a good one
Diaz leaned in so much, was so front foot heavy, that, while he was very busy with his hands, he didn't turn weight on a lot of his punches. Gatti hit harder, he got his hips into his punches more than Diaz. That's a pretty big deal when two guys are going to meet in center ring and trade punches.