If they think they can turn him into a small forward/part time wingman who can run around doing the defensive things first and foremost, i’d say keep him on.
Richmond showed it this year, bulldogs last, you need those guys able to put on maniac pressure across the whole game.
If he could take as you say greens role and help with the defensive pressure, then who knows he may be able to float in and out of games like the rioli boys do.
Even adelaide have it too, people thought they’d struggle this year with only sloane as a big name in the midfield.
However you get the right mix of defensive players who put on that manic pressure, who can also use the ball, and anything can happen.
I’d keep him solely for that, and tell him to get his fitness up, or it’s his last year. Don’t care if they even pick him up on the main list for a year and pay him the right wage to get said fitness right without outside worries.