Another Possibility

Everyone is focused on Tiger's excuse of fatigue for his missing the Tour Championship. I've certainly posted extensively about it. But there is another possible reason that no one seems to be considering. Tiger has that 'win streak' going on the PGA tour. In the past 10 years, he's only won the Tour Championship once - a success rate of 10%. So, it's quite possible that Tiger is protecting his win streak by not playing in a tournament where he's lost 90% of the time.