Periods of over 12 months:
1. Essendon 2000 to late 2001
2. Geelong early 2007 to very late 2008
3. Collingwood mid 2010 to very late 2011
St Kilda 2009 the next best.
Yet no mention of the 3 peat Lions.
I'd back them against all of the above in a final series.
The fact they dismantled the Essendon side this thread was created about is proof enough, then proceeded to make another 3 grand finals in a row.