I AA wins this even though JW wasn't his best weight. This is a great matchup between two of the most technically sound fighters that I can think of. I do believe Tszyu was the more natural and powerful fighter between the two at 140 but AA was the better overall fighter and would take this on points.
That pin point straight right is going to find Kostyas chin. He will be able to take some but a cumulative effect results in a tko loss