I remember watching him coming into the game when we were affiliated with Sandringham. I used to watch from behind the bench and saw that he was such a tough competitor, and was thrilled when he got picked for the seniors.
I love him to bits, and he has been a genuine club legend through incredibly tough times, but sadly I feel the game has started to pass him by, and it may be in his best interests were he to retire at year's end. It would be more sad to see him dwindle off and play his career out at Casey.
Jack Viney is a slightly different story - hugely competitive (as is Nathan) and also hard as nails, but my thoughts are that he would be in his and the club's best interests to relinquish what really does appear to be the added burden of captaincy (probably to Max or possibly Tom) and concentrate on getting his body right and regaining his competitive beast self.
It would take an enormous amount of courage (which he has) and also a lot of insight (which I am less certain he has) to do so.