I don't think Hughes or Buchholz makes 30 starts. I really don't think Matsuzaka makes 30 starts. The difference being the 6th starter on the Yankees is Joba or Hughes depending on who is the 5th starter. The 6th starter on the Red Sox is Wakefield. He isn't going to have a 5.9 % HR/FB ratio again. And knuckleballer or not he is 43 years old and in decline.
But Hughes/Joba won't be the Yankees six starter. Whoever does not win the 5th starter spot will go to the bullpen in a late inning role. That player will then need to be stretched out again before he can start. Besides the yankees will likely not want to disturpt the pen by pulling the 8th inning setup for a few starts.
The sixth starter fir the Yankees will be someone other than Hughes/joba.
"I do not think baseball of today is any better than it was 30 years ago... I still think Radbourne is the greatest of the pitchers." John Sullivan 1914-Old athletes never change.