Because Amiss detracts points for poor accuracy.Happened again yesterday. Despite kicking 4 goals Jesse Hogan was seen as GWS's 9th best player on the field, losing to Bedford who only got 13 disposals and 0 goals but also got 13 tackles in the game which means 13 tackles are worth more than 4 goals.
Or Amiss, who also got 4 goals but was somehow rated as Fremantle's 15th best player of the match.