Even if Bentley was injured the exact same way if he went anywhere else, he'd be playing this season. It's a common surgery/injury.
The Staph infection is the real problem as it kept his knee from healing and that infection can be traced to an antibiotic resistant strain that been running rampant at the Cleveland Clinic.
The Browns are in a tough spot. It's very similar to when Winslow was injured then suffered the same infection and they were unwilling to take his bonus money, which they were entitled to do, for fear that Winslow would go after the Clinic in a malpractice suit and they're a major Browns sponsor and their official medical staff (IIRC).