Years and years ago, Johnny Miller said something that I found very interesting. I'll paraphrase.
"Swing aggression seldom changes. How some guys learned to swing the club just starting out, the amount of swing aggression they utilized - it's like a permanent swing blueprint wired into their competitive DNAs. Freddy Couples has always swung easy. Look at Ernie... never looks like he's trying to kill the ball. Then you see a guy like Daly, huge swing, goes well past parallel... he's trying to crush it. Why? Because that's how John has always swung the club since he started playing. And when you're young - you can manage it. But when you get older? There's a price to be paid. And it's almost impossible to lessen that swing speed and be successful after a number of years. These guys have spent their entire lives swinging the club the way they do, they've perfected their timing. Most guys that swing the club 110% never make that adjustment."
Tiger's swing has been very aggressive his entire career, and as a result he's paid an enormous price. He only knows one speed off the tee with driver, and that ain't gonna change. You change his timing sequence, the aggression with which he strikes the ball - he's lost.
He seemed fine two weeks ago, but then again - he did have the high-tech stress pad thingie on his neck for all four rounds. Just makes me wonder whether he was trying to play the ailing golfer, or whether there was a need to wear it.