Essendon have been cleared by the AFL tribunal and have every right to validly play footy, and thus if make finals and win. Even if the CAS judgement came down against the 34 there I don't think anyone could show (and very unlikely think) that they are playing this year with any benefit of anything that they may or may not get found by CAS to have taken. If CAS finds against them then it is from that time that any additional suspension (they have already done some self-imposed "just in case") would occur. And they did not win any GF during the time it is suggested by ASADA/WADA they breached the rules.
There are suggestions that the SUBSTANCES administered (I hate the reference to supplements...makes it sound so...innocent ) could give the players bodies an advantage for several years.