I don't expect the league would be enthusiastic about the Texans suing the Patriots. Owner and league peer pressure makes that a non-starter for non-Davis owners.Yeah, this is why I have to believe the situation is more complicated than just “Caserio wants to be Texans GM and the Pats won’t let him leave.”
And even if the Pats were trying to do that, I suspect Caserio’s response would simply be to resign, join the Texans and then effectively say “try to enforce my contract in court.” The Pats would sue and then there would be some settlement with some form of compensation going from Houston to New England. The fact that hasn’t happened is further proof the situation is more complicated.
Caserio resigning and sitting the year out and joining the Texans net year could be a possibility I suppose, but that seems like a lot of cutting off noses and spiting one's face on all sides.