Right but then you really get into excuse making, like the Federer fans, for Roger's losses early to Nadal. Of course everyone isn't exactly at their best every day. But you have to cop to their peak years and sometimes you have to admit that they didn't play better because of who was across the net. There is no excuse for Novak in the 2012 RG final v. Nadal, other than he met a superior player. He was in full flight, just off of his 2011 "new self." Same as Roger, in 2008, at 26, lost to Nadal at Wimbledon. He hadn't become a pathetic player...he got beat by a better one.
And you can't reinvent matches, esp. the ones that they didn't play. You cannot say he would have won the 2013 SF "if he'd played better," because he played his best in that match and was lucky to get it to a 5th. Nadal was basically the better player that year and beat him at USO, as well. And as to 2011, he wasn't going to win that final, either. I've explained why before. Doesn't matter...he lost in the SF.
But to go back to your thesis: peak Novak has played peak Nadal at RG and he has lost, more than once.