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Jack Z does this every offseason, loads up with 2 rosters full of pitchers. Awfully shrewd. He refuses to be stuck without any pitchin options, and he knows that 1-3 of the 5-10 guys who are probably not going to make the team, are going to show something and make the team. And 1-3 of the 5-10 guys who are pretty sure to be on the team, get hurt or can't pitch well or something.
Millwood and Perez I love as low-risk guys who could be very effective, either in relief, or spot starting, or taking a rotation spot if everything breaks right for them.