Weren't the cronulla and essendon cases completely different.
I may be wrong but wasn't it accused at cronulla that a handful of players sought out a few members of staff to seek illegal supplements, that it took place over a month and that the staff members were moved on. When investigated cronulla players took their right to say 'no comment' and when the investigators finished their findings and recommended the punishment they took it and concluded the whole affair.
The essendon situation was different. They had an eleborate drug system put in place by their head coach, they hired staff specifically for their illegal drug practices, the entire team was put on the program and the program lasted over a season. When essendon were investigated the afl itself got involved, cover-ups took place, the afl made their own ruling on the case were it basically said 'the Afl finds that no afl players are guilty of drug offences, yet essendon are banned from the finals for 'reasons''. Whem the real investigators finished their findings and offered a punishment, essendon and the afl in their arrogance and belief in their own powers to cover things up turned down the offer, not wanting the bad pr of being found to be drug cheats, but that only caused wada to come after them hard.