While I am not a huge fan of that rotation and the trickle down effect it has on the bullpen, I certainly can see it happening.
I'd love Schwarber back, but the reality is he becomes a difficult player to fit into the lineup. But I would not rule it out.
The Sox do have a potential outfield logjam with Verdugo, Hernandez, Duran and Renfroe (and maybe Schwarber?). I suppose it is possible one of them - most likely Duran - is moved in a deal for a SP.
The Sox could certainly field a competitive team with minimal acquisitions (C: Vazquez, 1b: Dalbec, 2B: Hernandez, 3B: Devers, SS: Bogaerts, LF: Verdugo, CF: Duran, RF: Renfroe, DH: Martinez with a rotation of Sale/Eovaldi/Pivetta/Whitlock/Houck) beyond maybe a bullpen arm or two. But I don't think they will...