Except that they have seen him day in and day out for a year and a half. They clearly don't like what they see and are moving on. Sure, we can say "oh let's give him a shot," but ultimately we know .0001% of what those guys do. It seems like they are cutting bait and don't believe he'll ever figure it out. We're talking about a 29 year old, not some 24 year old who still has room for growth. Castillo is who he is and they don't seem to like it much.