One thing I have noticed with Grix during the warm ups is that when the tackle shields come out he doesnt do the tackling he is walking behind them shouting orders to the defenders. I dont recall Max, or other full backs we have had over the past few years do this. It could be my 40 something year old memory playing up so if Im wrong forgive me.

I didnt think I'd say this 3 months ago but based upon the above Grix could be the man. But like others have said this could hinder Max's progress.

Yes, I have also thought Miller as well as Ashurst. I have noticed when defending, Sio is also vocal but doesnt do 80 minutes

Max will learn off Grix and will get his chance when Grix picks up a knock (which is inevitable) he is at the back end of his career and highly unlikely to play all the games. When Max gets his chance he'll have to prove himself and then its his spot to lose..