Is that a good idea? Yes...under certain circumstances.
Firstly, Millwood was not so bad last season. He was not great but not so bad. His ERA was a hefty 5.10 but his xFIP was 4.46. And he did have his moments:
ERA April 3.38 May 4.29 June 8.82 July 10.66 August 3.54 September 3.82
He has his uses, even at the tail end of his career. But only in a particular role. And right now that role is as a AAA pitcher.
The current rotation in Norfolk right now is some combination of Ryan Drese, Mike Ballard, Rick VandenHurk, Chris George, Chorye Spoone and Chris Jakubauskas. None of them are pitching well. Anybody feel OK with one of those guys making a spot start?
Brian Matusz and Justin Duchscherer are coming back at some point. But until then, the Oriole rotation is a bit thin right now. If Jake Arrieta's hip acts up on him, I'd rather call up Kevin Millwood than Ryan Drese. And there is little risk that Millwood will take a full time rotation spot from one of the young pitchers.
Will Millwood sign a minor league deal? Who knows? But that's the only way he fits on this team.