The trade market isn't frictionless enough for this sort of thing to make sense very often. Bradley's on a 6-8 WAR pace this season. We'd expect him to slow down somewhat with the bat, but we'd also expect him to defend better than he has in his first 40ish games.Is it completely crazy to want to sell high on JBJ? It seems like they have to trade one of Bradley, Betts, or Benintendi (who jumped up to #6 on Keith Law's latest top 100 list). Given that they'd end out with three center fielders, another team would value one of those guys higher than the Sox. Benintendi is the youngest with the most team control, although he also has the most risk so I could see trading him as well.
I'm biased, but Mookie is my favorite player on the team so I want to keep him. His bowling makes me think he's just one of those people with freakish hand-eye even by pro ballplayer standards.
What would be a trade that would make sense for a player with that performance with under two years of service time? It's just hard to figure out a trade that isn't at best trading a quarter for three dimes, which makes no sense when your roster is deep and your window is now.