It's all about $$$. Dice-K makes the big bucks. He starts.
Rightfully, he should be in the bullpen right now, until he is ready to start. Same for Buchholz, who clearly wasn't ready to be no.3 starter in April.
Too bad the Red Sox front office has such a sharp line between starters and relievers. One of their errors they get away with. I'm not happy with them the last few years. And the same guys are still there, except for Epstein. I don't think much has changed, except Henry has taken the money away from them.