I believe that they know exactly what each player was given. They just don't want to tell and they destroyed all evidence because it would incriminate them more.
There is no way they would inject different stuff and or quantity, into different players, without being able to keep track of the results.
Do you really believe that the phone call the night before the investigation, was just a courtesy call?
They have said they don't know! Repeatedly. But then follow that up with that they think it is okay that nothing "illegal" was "injested" which is a lot of semantics and misdirection going on there. I have been following this saga very closely since it started as ethics is something I have knowledge of and I have been a coach myself and duty of care toward my athletes was always your first priority. Neither of those things appear to be of concern at Essendon. Even with their continual 'omg think of the players' bleating they do.
Continually they have asked Dank to tell them what has been given, or said he has the information and they don't. Funnily enough they haven't pressured him more than this. So yeah, pretty sure they have a fair idea what was given but never ever want it known.
Then they have asked the AFLPA to tell them what has been given to the players as the AFLPA was so concerned about it that they have set up a monitoring system for the players due to what was possibly been given. Which, incidentally Essendon agreed to from the start as they are so concerned about the players. This was all announced in February. Guess what, Essendon still have not signed off on this and it hasn't started yet. Yeah, they are soooo concerned about their players. The only thing Essendon are concerned about is not getting done for what they actually did which was a serious lack of duty of care to the athletes in their care.
They should be able to keep track, but apparently only Dank did this.
I know that it wasn't a courtesy call as the prior year they were being talked about everywhere as to the program in place and the use of PEDs.
So if as you say they do know what each player has been given, but they won't tell those players who have asked, or need to be reassured, then isn't that a hell of a breach of their duty of care?