I think the league has to review tackles like this whether a complain has been filed or not. Otherwise, there wouldn't be any justification and the number of injuries from vecious tackle is going to increase.
Also, its a joke talking about Hibbert in the same league as Carragher. Carragher has all the skill in the world even dribbling. But he elected to play a more simple game. Carragher is skilled while Hibbert is too one dimensional.