If we want to move on from Vazquez, a player who might be worth targeting is Mitch Garver. Minnesota is very likely to launch a massive rebuild after a very disappointing season and Byron Buxton declining their offered extension.
Garver is already 30, but just entering his arbitration years, which will likely be pretty expensive. On the one hand, injuries have limited his playing time, but on the other hand, he has the kinds of skills that the arb process rewards. He has a career .256/.342/.495 line in about 1000 PA, including 53 HR and 52 doubles. Since his breakout 2019, his line (including a terrible 2020) has been a marvelous.254/.349/.548. He has tremendous quality of contact, a manageable K rate and a decent walk rate. He wouldn't likely hit fourth in Boston as he has in Minnesota, but adding another .850+ OPS at an up-the-middle position can really lengthen a lineup.
Now the caveats:
I don't know what to make of his health going forward, but the injuries that have limited his playing time don't appear to have been chronic. Shohei Ohtani messed up his ankle in a collision back in 2019, which cost him a few weeks, but he came back and finished the season strong. He missed about a month this season due to "groin contusion" that required surgery — yikes. But since returning, he's been hitting .299/.394/.552 and mostly cleaning up for a pretty good Twins lineup (the issues in Minnesota are pointedly not the offense: 103 OPS+, 88 ERA+). He's dealt with back issues, which sound like the most concerning issue going forwards.
I don't really know what to make of Garver defensively. He's big for a catcher. Defensive statistics are obscure in the best of circumstances, but I really don't understand how they work for catchers. Statcast had him as a terrible framer until this year, when he leapt to the 88th percentile. Is that just some luck with umpires, or is that a durable improvement? I have no idea. DRS hated his 2018, but has graded him as about average since then. In terms of the running game, Garver has only caught 19% of SB attempts in his career, and runners definitely try running on him more than they do on the Sox' catchers: about 50% more per inning caught. But that stuff is so hard to evaluate, because it's basically all confounding variables. Is his poor performance because some pitching staffs do a better or worse job at holding runners? Is it that, playing in the AL Central, Garver faces more speed-oriented teams that run a lot, like Cleveland and especially Kansas City? So is Vazquez catching more runners because he's throwing out plodding Orioles and Blue Jays, while Garver is getting beaten by the Royals' speedsters? Do the Twins more often find themselves in game situations where stolen bases are an attractive tactic? You could imagine that teams playing Boston, who plays in a park that has a huge park effect boosting doubles, might feel that their fast runners are in scoring position on first.
So why would the Twins trade him? You could readily imagine the Twins deciding to go with their glove-first rookie Ryan Jeffers as the primary catcher in a rebuild centered on younger players like Arraez, Kepler, Kirilloff and their top infield prospect Royce Lewis, and cash out Garver. You could imagine Dalbec or Duran being appealing additions to that young position player core, but what that team really needs is pitching.
Thoughts?