Spot on - he needs to syphon off a bit of Beau Water's mentality. Die winning the ball if need be.
Why does he need to do this though?
You don't judge Glass on how many goals he kicks, why do you judge a purely outside runner on his ability to get contested ball?
Gaff is our best outside player, doesn't tackle or get many clearances or contested ball, but does his role to the best of his physical ability and is therefore one of the best wingman in the league - or will be in the next 2-3 years.
I don't think you want Morton going overboard putting his head in and getting the ball, you'd like to see some intent (which you do see from Gaff quite a bit, and from reports, a lot more of at training) but if everyone jumps on the pill you're not going to go very far.
For Morton it's got nothing to do with his contested ball, that's only been highlighted because of the Lade incident. If Morton had been displaying his sublime skills and using his running to effect no one would care about his lack of contested ball.
That's what we need him to do, play smart, run smart and use his skills to move the ball forward with effect.