Retief has an awful lot of game. There's a reason he was part of the Big 5 (which disintegrated after Tiger found his game again).
I was stunned when he didn't hit driver, or at least 3 wood, on #13. I'm a fan of Goosen's so I know that he's prone to hook his driver, but still--there's a decent chance that, even if you miss the drive, you can still punch out and put yourself in position for a 4. Obviously, he was very uncomfortable with the shot and didn't want to lose the tournament on one swing. Playing away from his driver is not the sort of thinking that captures glory, but the man knows his game.
He hasn't fallen in my estimation. He calculated +2 would win the tournament (actually pretty close), played for that number and just came up a little short. He hit a couple of putts that nearly went in and got unlucky with his tee shot on 16. His weekend score of -5 was pretty impressive.