Adelaide used to be, but they've fallen away quite a bit. In terms of contested ball differential, it's:
Contested Possession Differential (top eight teams in bold):
1. Port Adelaide (+9.6)
2. Geelong (+9.0)
3. Adelaide (+6.2)
4. GWS (+5.0)
5. Sydney (+4.6)
6. Collingwood (+4.2)
7. Melbourne (+2.4)
8. Western Bulldogs (+1.4)
9. Carlton (+1.2)
10. St Kilda (+0.8)
11. Gold Coast (-1.1)
12. Essendon (-1.3)
13. Richmond (-2.7)
14. West Coast (-6.1)
15. North Melbourne (-6.3)
16. Fremantle (-7.9)
17. Hawthorn (-10.2)
18. Brisbane (-10.6)
?? What you on about?