Teams with better postseason shots have become sellers. The problem, with Duvall and Kike anyway, is that I think the returns would be so small that they would be better off keeping them and their puncher's chance at the postseason (if in fact that's where the stand at that point).
Paxton, he could be a different story.
While I agree that pieces like Duvall, Kike, etc are not going to return much of anything in terms of value, I think the bigger problem with keeping players like Duvall and Kike, in this type of scenario, is the opportunity cost to get some younger players more meaningful reps to get them started on the cycle of adjustments needed to be viable MLB contributors (or find out if they have that ability to stick in the first place) when the Red Sox could actually be a good team a year or so down the road.
If we believe that the MLB game is a series of adjustments - which I think most of us do - I think it's far better to continue guys like Duran or pick anyone from Worcester on that path as opposed to continuing to trot out guys like Duvall, Kike, Arroyo, etc. There is also, of course, the chance that said young players COULD be better. Even if they're not (assuming they're not) let them work on those refinements at the highest level with the best coaching.
Paxton, I still would like to see the team sell if they can get actual good prospects for him, especially since they seem to have dodged an injury (Though I will say that were I the GM of another team, I'd be very hesitant to give up anything of value for Paxton by taking higher stock of 8 games this season vs 3 years of injuries when talking about a 34 year old pitcher). However the bigger issue with Paxton and his position as opposed to Duvall, Kike, Turner and Arroyo is that there isn't really anyone in Worster that would warrant just getting rid of him to get more time for younger players.
Trotting out a line up of something like Verdugo - OF, Turner - DH, Devers - 3b, Duvall - OF, Yoshida - OF, Casas - 1b, Arroyo - 2b, Hernandez - SS, Wong - C isn't going to win a lot of baseball games at the MLB level in 2023 and it's also going to "cost" the team by not getting a chance to look at younger players.
Trotting out a line up of something like Duran - OF, Verdugo - OF, Devers - 3b, Yoshida - DH, Casas - 1b, Valdez - 2b, Wong - C, Hamilton/Rafaela - SS; Abreu/Rafaela - OF also isn't likely going to win a lot of baseball games at the MLB level in 2023 (or it could, who knows, that is the "joy" of unknown prospects vs veterans whom are already not winning) but it could help the team get a jump start on maybe making it a 2024-2030 window instead of 2025-2030.
To be clear, I'd still absolutely deal Paxton if there is a GM out there whom would give you legitimate prospects / pieces toward 2024 and beyond for him. I'm just not overly confident there would be AND it's not like you have high minors pitching prospects knocking at the door the way you do in some of the positional pieces.