On what Cox has shown this year his chance of averaging that at seasons end is very smallI'm not sure if you're referring to Cox because he's certainly rucked every game he's played this year.
I do find your Dawes comparison interesting but there circumstances are hardly similar.
Dawes came through all the elite junior pathways, was a highly touted junior who only slipped in the draft order due to a knee injury, generally played with Cloke and Brown type support tall forwards and 2010 (his 4th year on the list) and 2011 (5th) he was playing in a GF quality level side.
Cox has always played as KF/ruck, has just started his 4th year playing footy, full stop, and has never had the quality support Dawes had or the played in a side that's a patch on our 2010-2011 sides. He'll never be a high possession player but he's already match Dawes highest ever goal output of 4 goals.
If by seasons end, he can be averaging 10 possessions or more, 5-6 marks or more, 1.6-2.0 goals, along with his 10-20 hitouts, I'd say he's played his role, in much the same way Dawes did, just in a different way which is as you'd expect given its a different role.