Having Lester pitch like this make a huge impact on the starting pitching. Really we are winning these days when we do win on starting pitching and Ueh. At least in the NL games it has been tough to get to Ueh though. Farrell may have to start to trust these starters a bit more so that it is easier to get to Ueh.
With Lester pitching like this, even without Buch this is a really good rotation. That said, they probably still need Buch to make a real run at it. This team has the potential to go a lotta' innings without scoring many runs. There best shot seems to be being able to go toe to toe with starting pitching in a seven game series. Without Buch they might lose game one to somebody like Detroit. But after that they can go head to head with anybody. Then again, in a seven game series, you are facing some monster like Scherzer in games 1 and 4.