Hes like Campbell, per my theory. But I don’t really know to what length they are going to block him. I suspect they plan to sign Alonso for 1b and start with Yoshida at DH, since he is also still here and more likely to be healthy and ready to go. But should Yoshida falter, or Casas excel, Triston is back in the picture.
If the Sox bring back Bregman and also sign a second tier 1b like Hoskins, Bell, Mountcastle, it gets more complicated but Casas will likely get a chance to get back into the lineup at 1b or DH, depending on how he does and how Yoshida or the new 1b does.
I also think this kind of might prevent them from brining in 2 marquee infielders from free agency…