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Aero can't compare Mayweather and Tyson, completely different styles. Mayweather is all defense, Tyson is all offense and aggression. Plus Tyson was dominating cans for a huge chunk of his career. Plus the difference between 220 and 270 isn't as significant as the difference between 140 and 190 (which is essentially the weight gap between Mayweather and Silva). KO power etc. Yeah, not an appropriate analogy at all.
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Knucklehead Silva has had pro boxing matches and has sound, crisp boxing technique. Jones is a converted wrestler who's a freak athlete. Again, not an appropriate analogy.