I wonder if it is the comparison of how Rory's motor runs as contrasted to how Tiger's motor revved up when he was Rory's age. I mean to say that Tiger was hard wired and molded by his Dad to be a fierce and relentless competitor, even as a late teen going into his early pro career. While Tiger got the big cash dump right at the onset, I think the competitive fire burned hotter than the new affluence cult of celebrity, and translated to a more focused desire to win, win, win. Rory on the otherhand 'may' not be discarding the new mantle of celebrity and wealth, and it may dampen the competitive fires from burning as hot as Tiger's at this age. I saw this in Rory and Sergio's palsy walsy walk-off embrace of defeat when they both didn't perform up to champion standards last week in the final round. Tiger would have no friends and would have barely acknowledged his playing competitor friend under such major championship final round conditions. Tiger at that age would not do a palsy walsy walkoff, no matter if he didn't post the needed score to get into contention, like Serg and Rory displayed. Tiger would have sulked, kicked things, and beat up on himself and anyone in the way. So, maybe Rory is a nicer guy, likes the trappings of his few but impressive early triumphs, and just won't burn as hot.