Over at the RLYW, SG notes that since May 29th, seven relievers in the New York Yankees bullpen have combined for 128 innings of 2.53 RA baseball. May 29th was the day that the New York Yankees moved Joba Chamberlain out of the bullpen and into the starting rotation.
It's only been a couple of months, but already Joba, with an assist from the baseball gods, has shown people why it was absolute lunacy to consider keeping him in the bullpen. Not only has he maintained his dominant stuff throughout his starts, but the bullpen hasn't really missed him. The team hasn't been hemoragging late inning leads. In fact, as far as my admittedly spotty memory can recall, they haven't blown one game that they might have won if Joba had been available in the bullpen (confirmation bias warning).
That's obviously not going to continue, but the larger point remains: it's just not that hard to pitch one inning of baseball. The difference between Joba and some random reliever pitching the eighth inning is dwarfed by the difference beween Joba and some random starter pitching the first seven. Case closed.