Yea, Castillo is there soley to fill in for Utley while he's hurt. I can see him being kept for the duration of the season also, since no one knows how healthy utley is going to be and having Castillo on the bench as an option would be a wise move.
Perez will probably get picked up by some team needing relief/starting pitching help. The Diamondbacks seem like a likey fit, seeing as Perez came up under the Kevin Towers era, and KT is quick to jump on bargain bin arms who are looking to bounce back.
The Pirates also seem like they'd bite.
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