I don't believe in this goat thing at all. yes, I'll give credit to Rog but I still think he was winning when the field was too weak. I mean, who were his competitors?
Well, top 4 players at the moment are stronger than top 4 in Fed's prime, however everybody bellow top 4 today suck big time.

Murray came in the AO semis having played dead-tired Nishikori, before that got a walkover, a 31 yrs old doubles specialist etc, that's a laughable draw.