With the admission today that their star catcher 
Jonathan Lucroy is on the trading block, the Brewers may become an intriguing trade partner for the Red Sox. One can foresee a potential "mini"-blockbuster that would send Lucroy, starter 
Jimmy Nelson and reliever 
Jeremy Jeffress to Boston for 
either Christian Vazquez or 
Blake Swihart, starter 
Henry Owens and third-base prospect 
Rafael Devers. The only painful losses in this deal would be Vazquez and Devers (considered Boston's #4 prospect). In Lucroy, Boston gets a 30-year-old All-Star level catcher who can 
hit, in Jeffress a reliever who can close (17 saves this year), and in Nelson a 27-year-old back-of-the rotation starter who has delivered a 3.62 ERA so far this year. 
Dave Dombrowski might still have to get another, more prominent starter, but maybe not. It's an interesting deal that would dramatically improve the team.