I think Cotto earned his money by fighting tough WW.
The problem with floyd is when was the last time one of his fights were announced and people were thinking thats going to be a tough fight. Never.
He's going to be forever critized any time he fights because he just doesn't ever find a tough opponent.
If cotto comes in a 160 that doesn't mean he will be a MW because MW weigh in at 160 and rehydrate to 170-175.
You need to learn that at least 95% of all fighter rehydrate. So there not going to change the rules for the 5% of fighters who don't.