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The only exception that I can see where money may not have anything to do with it could be the Cleveland Browns. They are keeping Watson in there because they are paying him a stupid amount of money. And he quit on the team on TV!!
He may get yanked in the next two to three weeks if he continues to stink it up.
Back here, Rattler, in my opinion, would have to play lights out for him to take the starting job. A team doesn't shell out that much money to have a guy sit.
I mean sure. Carr wasn't the problem on offense so Rattler would have to be really good and show that he can do things behind this bad OL that Carr can't. But if he does, I think he keeps the job as long as we are on a streak. They would likely just say that they don't think Carr is physically ready until such time as they need to go back to Carr. That way it doesn't get Rattler down as much if he has to be benched because Carr is "finally healthy" and Carr isn't embarrassed by a Rookie taking his job.