There is a significant difference in the actual performance on the mound if you look. Buch tends to give up early runs (if at all) because he leaves A pitch in a bad spot or gives up A walk because he looses it for A batter and that guy works his way around the bases. Even when he is up he is rarely up and right down main street. Virtually every other starter on the Sox staff throws meatball after meatball up there once they start going down that road and gives up runs in bunches as a result. It is a no win situation for all of them. V can't remove guys that are throwing early meatballs in the game because he can't afford the wear on the pen. Yet, you get the feeling at times that they will be lucky to not be down by double digits by the 5th inning.
So of the guys that started the season in the rotation and the guys there now, I would say that what Buch enjoys from the players is a level of confidence that they WILL still be in the game by the 5th and 6th innings as opposed to MIGHT still be in the game by then. That is certainly true for Beckett and Lester as it takes them whole innings at least to come around once they start throwing meatballs. Once Cook starts to get the ball up in the zone there appears no returning and he is on such a fine line that the upper half of the knee is up in the zone for him. Felix just finally ran out of gas as he approached his innings limit for the year and once he started to give up runs, there was really no turning back the tide. Morales is just to young at this point though he shows great promise and Bard has had an entire career as a project if you want to be honest about it.
Other than Buch the entire starting rotation has been a fail this year, not just Lester and Beckett, mainly because they started the season with a rotation full of question marks and pitchers with a known time line that would run out before the season would run out. Their answers to those questions were dice and Cook and I guess Morales. That was not a plan that had a chance.
Even if they get a solid 1 for this rotation, in the near term they will be hoping that Felix and Frank continue to progress, that Lester comes back (if he is still here) and will be hoping Lackey has something post TJ. Getting a solid one is the best thing for this staff especially with the young arms but even that is not a guarantee. However, a solid 1 and 2 and taking a chance on the rest is still a better bet than a bunch of maybe 2's that pitch like 3, 4 and 5.