First off, if you take any individual player's underperformance or injury, it may not be unexpected. The fact that pretty much everything went wrong is bad luck.
1. Hanley getting injured may not be a surprise. His awful hitting and his -2 WAR was very unexpected.
2. Masterson stinking is no surprise, but there was good reason to believe that he could rebound coming off an injury. Either way, it's the fact that he, Porcello, and Kelly all stunk to the extent that they did.
3. I didn't say Pedroia underperformed, I said that he was injured. Any player getting injured is bad luck.
4. I didn't mention anything about Taz or Koji burning out. I said that everyone in our BP stunk besides them. When you throw out reliever after reliever into games, you'd expect at least one of them to perform well. It's the philosophy of acquiring as many arms as you can and see what sticks. Somebody should have stuck. The fact that none of them did, and the extent to which they stunk, is bad luck.
5. And yet, when Napoli went to the Rangers, his batting line went from .207/.307/.386 to .295/.396/.513. Where was that when he was with the Sox? Bad luck.
When pretty much everything breaks against your favor, that is bad luck.