the tiniest weakness he has is probably blazing away when under pressure. The truly elite can pick out a team mate with precision under extreme pressure. If improves that part of his game he'll be unstoppable. He's shown glimpses, in the 'Raging Bull' video on the AFL website the first passage of play/vision is exactly what he needs to try do more often, lower his eyes when under pressure and show some composure.
I think this is probably not as much of a weakness as people make it out to be. One of those things where there is a time lag between performance and reputation. I reckon Danger's kicking has been above average this year, even under pressure. There was one outrageous kick in congestion where he hit Douglas lace out in the second quarter on Saturday. But his reputation precedes him and everyone still thinks he is an ordinary kick.