One of the reasons the Sox failed to develop any young pitchers is that it’s a myth based on double standards.
Fans who repeat this myth only count pitchers drafted/signed by Boston and pitch for Boston. And they always ignore the ones traded away, like Masterson, Hagadone, Kopech, Presey, etc. I suppose if they also counted the ones the Sox acquired like ERod, I could see the point.
And the notion that Sox coaching/development ruined Chavis and Dalbec and (before them) Middlebrooks ignores a really obvious flaw - all these players made the majors, something that is not the given that many fans seem to think…