If kellen wants to interview for that role I’d do everything I could to take back that extension if I were jerry.
If he signs elsewhere, the contract would be void anyway.
Just as if a coach is fired, and ay has 3 years left on his contract, and signs a new contract with another team, that 3 years is voice, or actually offset by the new contract.
So if the new contract is more, the old one is voided. If the new contract is less, then he gets that difference for this 3 years unless they come to a settlement.
That is how it used to work, I assume it still does.