The words "breach of contract" come to mind. Theo has an employment agreement wherein he performs certain duties, has authority over members of the organization, and is the GM. Stripping him of those duties or naming someone else GM while Theo is still employed by the Red Sox as GM would cause them a whole mess of legal trouble. That's possible, but 100% speculative. We don't know what options the Sox do and don't have, contractually. Which is why we must speculate about the Red Sox stripping Theo of his duties and title without any legal repercussions whatsoever.