Okay, you didn’t ask me directly, but this question came up in the comments on Brett Barnett’s latest article and I’ll take what I can get.
From lazy fan (their chosen name):
at this point as a Pirates fan I am more interested as to why all acquisitions are RH pitchers and Middle Infielders than their possible metrics.
It’s no secret that Ben Cherington likes his right-handed pitchers. It’d be easy to point out that since most people are right-handed, it stands to reason that there are more righties available. However, Cherington has shown in the past that he’s taken the “pitching wins championships” idea to heart.