For Lester, it's all about the cutter. When that's moving and located he can be effective. Though he's a tough competitor, I would never have said he has "ace" stuff. His overall velocity is down a couple mph. Although I'm not a pitching expert, I tend to think that reduced velocity would affect the life of the cutter, and hence how he can approach hitters.
Too bad - sox had won 2/3 and 3/4 and looking @ a reeling Toronto club in town. I was thinking sweep but not for the bad guys. Still a long way to go...hope the trading deadline comes soon because the Felix Hernandez wish upon a start talk is annoying.