If you are trying to get down to top 20 of all time I think you can immediately remove Syd Coventry, Bruce Doull, Kevin Murray, Doug Wade, Alex Jesaulenko, Jack Dyer, Keith Greig, Michael Voss, John Nicholls and Nathan Buckley.
I would definitely keep Nicholls, Dyer and Doull in the conversation for Top 20 of all time.