Not sure if it will affect him or not but he only ever had one fight at welter. Don't think coming down from that weight should put too much strain on his body.
Don't worry about hatton's weight. Read the article on here http://www.skysports.com/story/0,19528,12183_5265850,00.html he says he'll be fine and I believe him.
When does any Mayweather lurk around in the background? No I dont think he was there I didnt see him I dont think anybody did.