Can a Player Guarantee Performance of a Guaranteed Contract?

The answer to my mind is "no" but there are so many issues with the question you could get exasperated and drown in quicksand.

What does an NFL football team consider to be "performance"? Should the performance match the salary? How can NFL quarterback performance equal a quarter of a billion dollar salary? Aren't you claiming the quarterback is all you need to play football? Isn't that doom-decisive for your football team?

A billion dollar quarterback and 50 people making veteran minimum? That is union-busting for the NFL Players Association. Its job is to prevent a plantation economy not create one.

You would have to have a perfect clinical history, would you not, if you demand 250 million in GUARANTEED money implying you will be there every game to perform the contract? Isn't it near impossible for any player, even a clinically perfect physical specimen, to make that guarantee?

I don't know if the NFL/NFL Players Association CBA even addresses "nonperformance of contract" because it is looking like that is what this is. Ostensibly, if nonperformance were adequately covered there would be no problem signing people to guaranteed contracts. But there apparently is a problem.

No one in the construction industry would survive very long not performing according to contract.

Beyond one or two years, I'm astounded there are owners out there willing to guarantee contracts which are inherently not performable. 

At what point does dead money zombify the league? Ultimately paying something for nothing destroys you. In the real world. The NFL is not the real world. 

But even circuses go out of business.