If you measure "best" by most premierships for Parra, then it has to be Jack.
He directed his team to winning consecutive premierships for each of the three years he was Head Coach
1981,
1982,
1983. Please share if you know of other coaches with this 100% strike rate.
If you look beyond Parra to the entire history of Australian League, Jack is in the top 3 of mosting winningest.
ARTHUR HALLOWAY 8 Premierships – 286 games, 178 wins, 17 draws, 91 losses – 62.24%
WAYNE BENNETT 7 Premierships – 788 games, 489 wins, 14 draws, 285 losses – 62.06%
JACK GIBSON 5 Premierships – 394 games, 245 wins, 10 draws, 139 losses – 62.18%
KEN KEARNEY 5 Premierships – 284 games, 168 wins, 5 draws, 111 losses – 59.15%
JACK RAYNER 5 Premierships – 216 games, 121 wins, 4 draws, 91 losses – 56.02%
NORM PROVAN 4 Premierships – 181 games, 124 wins, 8 draws, 49 losses – 68.51%
CRAIG BELLAMY 2 Premierships – 395 games, 269 wins, 2 draws, 124 losses – 68.10%
CHARLIE LYNCH 4 Premierships – 184 games, 118 wins, 6 draws, 60 losses – 64.13%
CLIVE CHURCHILL 4 Premierships – 260 games, 148 win, 5 draws, 107 losses – 56.92%
TIM SHEENS 4 Premierships – 669 games, 340 wins, 11 draws, 318 losses – 50.62%
Personally, I'd rate Jack Gibbon's stats above Wayne Bennett as Wayne took twice as many games to achieve his 7 Premierships.
Kind regards,
Terry