The reason most often given for keeping JBJr is the exceptional defensive play in the large yard known as CF, Fenway Park. There is also the expectation that later or later (sic) he will magically find his stroke and start a 2 month run of hitting like many other MLB OF'ers. The Sox should hold JBJr until it becomes obvious that they are either in or out of the pennant chase around trade deadline. He may be in a hot streak mode by then , either helping the team or of some value to another.
My argument has been that if the other 7 guys in the lineup are hitting near their career averages or better, then the Sox can carry two lightweight bats (catcher & JBJr) The problem to start this season is that with the exceptions of JDM, Bogey, Beni to a degree , MM to a degree nobody else was hitting .200 .
Last night's game with the Rays reminded me of one of the 2018 story lines: When Betts is hitting and on base, JDM gets rbi's. When the lower third of the lineup participates (Vazquez last night) good things happen. When you get HR's just over the fence instead of 2 ' short, they win. All that came together vs the Rays, and that team looked much different than the prior 4 games.