We know some Sox fans will talk about Mookie forever, but I'd double his loss as nothing like it "in a Sox narrative over the last 40 years" (since the Fisk-Lynn-Burleson debacle). The Red Sox always keep their stars in their primes. Trading a guy just entering his prime and a year after he was the best player in the game was nothing like dealing Nomar or losing Pedro, who were no longer even the best player or pitcher on the team (Manny Shermaned his way out of town, enhanced LA for few months, then got caught about 17 times). Boggs and Clemens (pre-PEDs) best days were behind them.
This may even be sacrilege, but it is arguable based on WAR value: at the time of transaction, trading Betts was worse than selling Ruth. The Babe's six years in Boston were worth 19.1 WAR. Mookie's six-year WAR in Boston was 41.6.
Remember, the Babe was still doing the Ohtani-thing his last year in Boston. Unlike Betts, who led the majors in WAR in '18, Ruth didn't lead the AL or MLB in WAR in 1919, finishing second to Walter Johnson. Of course, Babe was only 24, but had unhealthy lifestyles (gone at age 53). Mookie might have a ways to go, though, before he beats George Herman's career WAR of 182.5...