It sucks it was only 4 games. It should have been for a season given the severity of cheating in the organization. But, to Goodell's credit (and I don't give him much credit, ever) he had to know that anything longer than 4-games would never hold per the CBA agreement. That's why Hardy's suspension was dropped to 4-games. Goodell knew that Hardy's 10-game suspension would never hold so he knew that he could always say "hey, I wanted to suspend him for 10-games, but the NFLPA wouldn't allow for it."
I'm not really sure what grounds Brady has to stand on for a lawsuit. Goodell can always state that Brady violated a conduct rule against the league with the deflation of footballs, not being forthcoming to investigators and destroying his cell phone and suspended him right in line with the 1st time offender guidelines of 4-games.
So much for the Patriots and Kraft accepting whatever punishment the league gave them.
YR