The thing that puzzles me is that if it's a "grey area", surely it has to be legal? If it isn't specifically banned then it's fair game I would have thought. It's the FIA's fault for not making the regulations clear enough, three teams have found an intelligent way of "interpreting" the regulations and therefore in my view have done nothing wrong. It's stupid to have a system where the FIA can say one thing and the stewards another, but what else did we expect??