Who knows if we become sellers? None of us do at this point as we are on the edge of selling. Of your list of field players I would suggest that we currently have 5 ML quality players on the roster, and 6 when Story returns. (JDM, Bogey, Devers, Verdugo and Vazquez). My view is that Kike has been marginal this year so I didn't include him.
I don't think we intent to extend JDM again so he could be traded as he won't be back next year anyway.
With Bogey, i posited that he might be a player to keep on the roster to help us with the Devers negotiation. If he would be willing to switch to 2nd base and do some DH, I could see a contract extension. Could we pay him enough to keep him? I don't know, but he is an important part of the team and we should try to keep him.
Vaz is a serviceable catcher who likes Boston. There aren't a lot of guys with as much talent out there. I know you have pointed out his defense is not top line, but if we want to maintain our competitiveness going forward, I would try to keep him.
Devers is a must keep and lets hope we can do it without venturing into Sotoland. No player is worth what he is asking.
Dugo is a serviceable outfielder on a team without a lot of strength in that position. I don't think we get enough for him to make it worth selling.
Story is our SS of the near future and I would keep him.
Other field players on our current roster are not people I would protect as I don't see them as a long term answer. I doubt we would get much for the lot.