Don't pencil in Valdez for a 26 man spot already. If he makes it, it will be as a UTIL guy, which is not the bench 1B role we're talking about anyway.
The question is would the Sox rather find a bench role for Dalbec or Hosmer. Dalbec can play 3b/1b and they are going to try to work him into LF. If they can give him more versatility and limit his at bats, he becomes more valuable to this team. However, if they don't think Dalbec is going to stick, they don't really have another option as backup 1b. Not having a platoon at 1b isn't the end of the world. Having Casas/Hosmer on 4/1/23 is at least a better option than going with Dalbec/??? like they did this season. Casas hasn't exactly broken out either. Maybe keeping Hosmer around just in case is a good idea?