Sox needed pitching and liked his pitch mix. They probably could have traded for him using a much lesser prospect though. Tibbs wasn't hitting well in POR, but was trying to adjust his mechanics to the Sox program and didn't have a long leash. It's clear that the guy can hit. Maybe they just thought he was really low on the depth chart? They probably would have dealt him by now, but I think it would have been better to get more than Dustin May out of the deal.