I have no idea how good Cory Doyne is. His performance at AAA this season suggests he could be valuable in a relief role, but it's certainly possible, perhaps probable, that he can't replicate that success in the majors.
Even if he can't it would seem to be something worth finding out. The Orioles disagree. Doyne was sent back to Norfolk in exchange for Kurt Birkins, and while Doyne might not have pitched particularly well at all, he was scoreless in three of his five innings this season.
Doyne could be an option out of the bullpen in future years. Paul Shuey, on the other hand, will not be. Less than four innings of work was enough to send Doyne south, but Paul Shuey is still here after 18 games despite a 7.14 ERA. What's wrong with this picture?
I've talked about this before, but the tendency to rely on experience over talent is something that has to change. What good does it do to have Paul Shuey racking up sub-replacement level innings with other younger options in the minors?