I think the only play that they have is that the NFL (Godell) backed Snyder when he said that Synder didn't interfere with the Wilkinson investigation (I have no idea if he did or not but I'm sure they could try to say Godell was 'covering' for Snyder).
The only other thing I can think of is if Godell could have punished the team/Snyder prior to this going to Congress (which I don't know if the $10m covers all of this or not).
Edit: And as your previous post states, it does not.