JJ was smart when he drafted the contract for this 6 time NFL pro-bowler

[theking]

He new McCoy has an Achilles heel so his team drafted the contract with the "quad" clause..Now, they can release McCoy without having to pay him per the contract. But then McCoy didn't lose out totally, he still got the signing bonus just for signing:

Unfortunately, McCoy's stint as a Cowboy was short-lived, following a season-ending injury to his quad during Monday's practice. As a result of that injury, the Cowboys have now released McCoy using an injury waiver on the quad tendon that was built into his contract.