He can't prove anymore... the leap up to true Welter would likely be a step to far for him... and he knows it.

So you right... he doesn't want to prove anything... just make some money by fighting the sports biggest names... if they were all at 135-140 then he wouldn't be asking for catchweights or talking about Welterweight.

He's in his twilight and just look to earn money, ala Floyd Mayweather.