I think this will be looked at in terms of a workplace injury, and the question asked of the principal (in this case the NRL with which control of the game lies) will be "Was the risk of such an injury as McKinnon suffered reduced to the lowest level practicable, all things considered?" This will likely entail scrutiny of refereeing, the use of on-field sanctions, and the match review/judiciary system, and what part each plays in controlling dangerous play. The Melbourne Storm club might also come under scrutiny, as the employer of Jordan McLean. Did the club do everything reasonably practicable to prevent its players performing lifting tackles like this, or on the other hand did it encourage them to do so, even covertly? Is what happens at this club typical of all clubs?
I'm not so sure McKinnon won't get awarded a payout, but whether it is in the $10 million league remains to be seen.