And given how their off-season went, they also would have very possibly extended him. No team looked more prime to spend then the Padres, since they had an elite farm of cheap players to fill the gaps and their GM was under the gun to produce a winner, per the owner.
Of the two, the Dodgers might have been the least likely, given that they had other potential mega deals coming up in the immediate future, primarily that of Cody Bellinger. (The Padres had Tatis, but there was no rush to lock him up just yet since he hasm't even reached arbitration.)
So if the sox kept him last year, he would have gone elsewhere via free agency since the Sox would probably not be able to afford him unless they cleared massive salaries elsewhere (Bogaerts and ?) And if they dealt him, the only two teams showing interest were both primed with cash to spend on an extension. So - who offers the best package? And was San Diego still trying to pawn off Myers as part of that deal? Plus not willing to take Price?