Agree with @Moose Milligan take here. Right now, since Mountcastle has options, it seems the best place for him to be is in Norfolk. Maybe he can swing a hot bat down there and get back, but the trend is not his friend.
I would prefer Hicks over him...right now. O'Hearn can play first against RHP and Urias/Santander can against LHP. If Hicks comes down from his cloud, Mouncastle is a move away. I still would love to find a way to get Cowser up here as well.