How can Floyd's punch-resistance be lower now if he never got hit?

[15rounder]

Age must be a factor in the sense it slows down a fighter and he gets hit more.

Floyd took some heavy shots against Cotto but overall he has very good punch resistance for his age.

Canelo just needs to time his punch right and then jump on him and take him out. If Saul does not do it then no one will.

This is spot on. The only thing I would add is that for those first 2 to 4 rounds..Canelo just needs to make sure he's touching him. If he lands a good shot then that's a bonus. But make sure you touch him. Hit him on the arms, the shoulders, who cares. Just find him. Should be an interesting match up.