I think this would be an interesting fight. GGG is a good fighter. Only flaw I see is sometimes when he jabs he leaves his head open for a counter. Mayweather also has slowed down which would be a plus for Triple G
http://www1.skysports.com/boxing/news/11067/9525631/george-groves-says-gennady-golovkin-could-move-down-in-weight-to-face-floyd-mayweather