I think Scherzer can help someone, probably on the west coast, but would be astonished if he came to Boston.
That said, if WAR has any value, the current strengths of the Sox are the bullpen and the lineup and decidedly not the rotation even though it is to their credit that all five (Eovaldi, Pivetta, Perez, Richards, and ERod) have started 19 or 20 games apiece.
When and if Sale returns with the same ability he had when he arrived in Boston, the Sox mantra could well be, "Eovaldi and Sale, then pray for hail."