Let's not overblow the need for pitching here.
The Sox won 92 games with virtually nothing from Sale. Now, maybe this is Sale going forward, but maybe not. Either way, is there a free agent option available that is a definitive improvement over what we expect from Sale next season?
If one of Houck or Whitlock move to the rotation, that leaves one spot remaining that might go to ERod (along with Sale, Eovaldi, and Pivetta). If ERod is not returning, that leaves one available rotation (re: expensive) slot to fill, before acquiring all the uninspiring but necessary depth arms. In the bullpen, I expect to see Houck/Whitlock, Barnes, Brasier, Taylor, Davis, Hernandez and Sawamura. So maybe one or two relievers, and probably some MiLB depth.
I expect additions, but unless if ERod returns, it might not be so drastic.
And depending what happens with Schwarber and/or 2B, the Sox do have adequate trade bait with Duran to make at least one pitching acquisition...