Sav Rocca retired in 2007 and Ben Graham in 2005. A lot has changed in the 17+ years in the way players prepare themselves and the facilities available to them to allow them to do so.I do remember an interview a few years ago with Sav Rocca after he played a couple of NFL seasons. He said NFL is a harder game to play, coach and requires much more athletic preparation than anything he saw at AFL level. I heard a similar interview with Ben Graham. This is from 2 afl vets who know both sports intimately.
Their opinions are relevant to when they played, not now.