While i agree its silly for Floyd to fight GGG just leave it at that. GGG is a middleweight Floyd a true Welter, end of story.
But when you go on to say what elite fighter has GGG beat, what elite fighter did Guerrero beat? How much money was he making prior to Floyd? Also GGG made $300,000 in his last fight because he's fighting five times this year.
Additionally GGG has credentials, his amateur career was phenomenonal (300-5) and beat all the top guys. As a pro its not his fault guys have ducked him (Sturm, Ndam, Quillin, Murray, Geale).