Voting is made up from 4 people, Bluey, and 3 assistant coaches. There is no limit for the number of players who can be assigned votes in a game, but the maximum for a player in a game is 20. So for example when Bennell played against Freo at home and got 37 touches and 3 goals, he got the maximum votes. Also against you guys at home, the voting committee felt almost the whole team performed admirably and 18 players were given votes.
I think the main reason why he finished 18th was he never really broke many games open. He had some great games were he kicked 3 or so, and no doubting that he worked hard every game, but this season whilst playing every game certainly could have been better. Has also had a bung shoulder since opening round, which he's only just got surgery on recently, or in the next week or so.
edit in bold
Funny thing is that all the GCS posters had him finishing around 5th - 8th in the B&F and he finished 18th. Very odd even with your informative explanation, thanks for that