I'm not sure if Floyd would get dominated by Winky, but I would definitely make Winky the favorite going into the fight.
Winky has fought his entire career at 154 and above, whereas Floyd has spent almost his entire career in the 130s and 140s.

I don't see how this fight ever happens. If Winky weighs close to the 170 pound limit against BHop, then that's too much to ask of someone Winky's age to drop all the way back down to 154.

I don't see how Floyd would agree to fight Winky at anything above 154. Floyd's already far enough above his natural weight class as it is.