You're right, but you're not. What you're right about is that you've highlighted one of several strong reasons for saying Goodell operated in a way that was arbitrary and unfair.
The case still boils down to:
Brady/NFLPA -- This was clearly unfair, for multiple reasons.
NFL -- That may appear to be the case, but Article 46 says that the Commissioner is the sole judge of fairness.
Either the judge buys that argument from the NFL or he doesn't. (I think he won't, for reasons like those quoted in the "Houston" thread I just started.)
Sure, but the NFLPA has a few lines of reasoning.
1. Goodell cannot delegate the decision to Troy Vincent. (I think this is a weak argument because he said in the letter the commissioner authorized me to...)
2. Even if he could he cannot then arbitrate that decision when the arbitration involves his own conduct.
3. Even if he can arbitrate, the investigation can't be fundamentally unfair/non-independent.
4. Even if Goodell is allowed to conduct a not independent investigation, claiming they are doing an independent investigation- means they must.
5. Even if they are allowed to be non-independent and unfair in their verdict they still cannot issue punishments for "general awareness" or for policies not given to players.
6. Even if they can issue punishments based on those standards not listed in the CBA the punishments must be in-line with the CBA or law of the shop for similar offenses. (Evidence is given of similar offenses with no punishment).
Goodell might be right about points 1, 2, and 3. He probably is by the CBA. But I think points 4, 5, and 6 will be tough. From his filing it doesn't even look like he even attempted to address them. IMO