I wouldn't. I'd keep him at 3B. My point was that, if for some reason, 1B is where he belongs, I don't view Casas as a lock to own the 1B position for the next 10-12 years.
Nobody on our roster "blocks" Devers.
If worse comes to worse, one can play LF or we trade Casas.
If One ends up DH, it wouldn't be terrible. I see Devers as being a very good defensive 1Bman, if he ends up there.