Rafa on clay was a beast in 2006, that's true. I often said it, but Roger's supreme chance to get on top of Rafa was in 2005, at RG, before Nadal became ironclad in his clay self-belief.
Who else was a beast in 2006? Who else could stop Roger, off clay? What Rafa was to Nole in 2011, who was that man to Roger, in 2006? Could take a while, this one.
Moxie is right: Roger was a force still in 2011, and the proof of this is that he began his march back to the top in that season, and he was playing great enough tennis to stop Nole in Paris, and almost in New York. So Nole had Fedal to contend with - Rafa in his pure prime, and a potent Roger. That's enough field for anyone with only one slam to their name to have to face...