Boston can squeeze him on the roster by DFAing Ali Sánchez, who is a good bet to clear waivers and no real loss if he doesn’t. Lowe isnt much better vs RHP than Toro, but has shown a higher ceiling. And if nothing else, Lowe does have a Gold Glove in his past.
They could also still keep Toro, just in case, if they DFA Sánchez. A bench of Romy, Refsnyder and Toro seems adequate.
But if I’m Lowe, I’d prefer the Yankees. (Are they interested?). Goldschmidt is out for a bit, the ballpark is more conducive to lefty power bats, no Romy or equivalent to platoon with, and they have a better opportunity to start next season, since Casas is likely back and Goldschmidt potentially isn’t.
Of course the Yankees are probably just as likely to non-tender Lowe as Boston and instead pursue better/cheaper first sackers next year…