Random question as I'm making pecan chicken and bored out of my skull

Does a fighter 'retain' the chin they had at a higher weight? Obviously power would suffer as there is less but in a Spaceballs like world the shots of a 140 guy bounce off the chin of a former cruiser, heavy type Seldon, Hide comebacks on deck, heffers!

Really in a unicorn world though, I can easily see Ward giving Mayweather probs and taking a W. More than physical, just as ass clown cocky and knows slippery and gritty rough infighting, fast hands. Hey, one of em losses, win win fans