Nope. Good argument though, but for an estoppel argument to get up, you need to show reliance on an event, and ongoing detriment to the party if not estopped.
Also, the AFL (and the EFC) arent a party to these proceedings. Its ASADA the players are trying to stop, and ASADA have made no guarantees to the EFC or its players that the players can claim they have relied on to their detriment (that Im aware of anyway).
Funnily enough, Essendons insistence that the AFL scrub all references to drug use in the outcome, and make it clear that the penalites were for 'governance failures' only also kinda shuts out this argument should they try and 'estopp' the AFL (and not ASADA) from seeking further action at a later date. Essendon have maintained that they werent punished for drug use then, and the AFL were equally clear that the punishments for drug use could very well be forthcoming regardless of 'poor governance'.
That decision may very well come back to haunt the bombers if drug use is proven and the AFL want to hammer them seperately from ASADA.
Just on that, is there anything odd about the fact that the people named in the case dont appear to be actual players ?
Are there any standings issues ?