You have scienced the shit out of it.I overlayed a photo of Big Cohuna holding a Sherrin, over a pic of Pav holding a Sherrin, halved the opacity on Treacy's pic and matched the Sherrins size for size, then dragged Josh's hand over Pav's and they are exactly the same size.
So unless I'm mistaken, there's no reason he can't win 6 Doig's and 6 All-Australian's with those mits.