For the bench I suspect it starts off with fairly strict platoons. Alcantara backs PCA in CF, Austin backs Busch at 1B, and Shaw backs Mo at DH (via Bregman, Shaw obviously in the field).
Except for Austin all of these guys are hopefully here for the long term, so I think you can let guys organically grow into more time. Happ's not a liability against lefties but certainly isn't an asset, so I think there's some playing time to find there. I think there's some opportunity to get Mo a little time behind the plate too. And of course injuries will occur.