I honestly think that it's worth believing Rafa when he says he's so amazed and pleased to be back, given the foot issue, that he does play with a bit more freedom and calm. In a way, he may feel like he's playing with house money. And I do believe him when he says that, while, as a competitive person, he'd love to have the most Majors at the end, it won't change his happiness not to, "not 1%." Contrast that with Novak, who has full-on said that he wants all the toys at the end of the day. I'll say again that it may have been the difference in their QF last week, though Rafa being the better at RG is not to be discounted. They both knew that the one who came out of that match still in the draw was likely to be either tied in the Majors race, or two up.
It also brings to mind how Roger declared, long ago, that the singles Olympic Gold was a personal goal. And in 2012, after successfully defending his AO, Novak declared his two remaining goals for the year were RG, and the OG. Well, it took him 5 tries to finally get RG, and he's still waiting for that Olympic Gold medal. Rafa never said anything, and he's got two. There's something to be said against putting the pressure on yourself, publicly.