Floyd has skills, but throughout his career he has depended a lot on his legs and reflexes, these go before speed and power... look at RJJ. The difference is Floyd is Super schooled and has more tangibles. But waiting for Manny to get old is not a good idea, because the older he gets the more vulnerable he becomes.
Castillo didn't beat little floyd, and little floyd had a torn rotator cuff and fought through it. If Castillo had a good jab, he wouldve been far more successful in that fight and in the rematch. Furthermore, Pac doesnt go to the body nearly as much as he should and that is one area where he would have to focus on, but he is not a great body puncher. All the fighters who had success against mayweather it was through their jab... that includes shane hurting mayweather in the 2nd the first time... jab to the body brought his hands down.