now narrow it down to those that play(ed) as Ruck/forward to those that are KPFs
From that list, the KPFs would be:
916   37   Lounder, Richard   1967-01-20   203cm   116kg   4 (2-0-2)   5   1989   22y 100d   22y 120d
1134   34   McBean, Liam          1994-08-25   202cm   93kg            2 (2-0-0)       2015   20y 265d   20y 278d
1096   24   Griffiths, Ben          1991-09-17   200cm   102kg   48 (27-0-21)   28   2010-2015   18y 254d   23y 361d
1084   29   Vickery, Ty                   1990-05-31   200cm   98kg        102 (49-2-51)   132   2009-2015   19y 13d   25y 105d
Lounder kicked 4 goals one day while leaning against the goalpost  

, while the other three represent the change to bigger footballers playing non-traditional roles these days (they would've all be used as purely ruckmen/followers 20+ years ago).