Let's compare the career numbers for these two young pitchers:
Player A: 50-35 / 3.53 ERA / 119 GS / 115 ERA+
Player B: 36-25 / 3.84 ERA / 79 GS / 117 ERA+
Player A is 26-year old Jair Jurrjens of the Braves who was just sent down to the minors because he has been ineffective so far this season going 0-2 with a 9.37 ERA in 4 starts. Player B is Clay Buchholz of the Red Sox who at 27-years old is less seasoned than Jurrjens but who is having an equally bad season with a 1-1 record, 9.00 ERA in 3 starts.
The comparison of the players maybe brings out more of a comparison of the organizations. Jurrjens was hurting the team and so was demoted. Buchholz is hurting the team but will anyone even broach the subject of sending him to Pawtucket? This is an option that has to be considered especially with the prospect of losing Aaron Cook (3-0 with 1.33 ERA in 4 starts) if he isn't brought up to the big club soon.
EDIT: I should have mentioned that I know that Jurrjens isn't the same player because of his knee issues but the same can be said of Buchholz and his back issues. The difference is the Red Sox have control over Buchholz until at least 2015 (with a 2016 option). That should be even more reason to send him down to make sure he's operating at 100%.