Adelaide did win in 1998,from 5th spot, in a different finals format (McIntyre Final 8 system). Where the two lowest-ranked losers are eliminated from the finals, while the two highest-ranked winners progress straight to Week 3. Adelaide lost to Melb in week 1 yet qualified to play Sydney in week 2 and the rest is history.Since 2000, the finals have been conducted under the eponymous AFL final eight system. Basically designed to give higher ranked teams an easier path to the premiership. So if you're an interstate team and not in the top 4, goodluck winning the Cup.