on youtube http://m.youtube.com/watch?v=d7xzBfVlxeo although the video is old, i dont see how Khan will ever beat Mayweather, Hunter himself knows this.
"If you put Amir Khan of today in there I believe he'd be in with a rude awakening" - September 2013. In between him saying that he pretty much says that if Khan dedicates himself he has the ability to achieve great things at 147.
Everyone including their mothers know that The-Con-Man would be knocked out relatively early in the fight. He would not come close to outboxing Mayweather. Everyone knows Khan possesses one of the worst chins in boxing history and he would seriously be destroyed utterly and irrefutably by Mayweather if that fight surfaces.
Nothing to do with power. I think its more about styles. You need to take risks to knock someone out. I can't blame you for not counting it but last KO was 2011......technically.