Big Papi was a minor league free agent when they signed him. That’s probably more in line with moves they would love to make now. Pedro, Schilling, and Beckett were all acquired via trade because the Sox had minor leaguers other teams were willing to accept in deals. Sure they were salary dumps, but they were all “dumped” in Boston because the Sox were able to put together better deals than other teams.
That wasn’t the case in 2020. So far the best hitter Boston has brought up through their system since Devers is Duran, a guy Sean McDonough described less than a year ago as “not a Major Leaguer.”