I guess I am a bit confused then. the linked post is a comparison of tank classes, a pretty telling one I think too, and yet we should avoid discussing what it might show ?
I think it highlights what some people have felt for a while that after the introduction of the heroic class, some other classes are not scaling well enough to keep up in all round tanking viability. It appears to me that with some classes there are many benefits and very few drawbacks and the benefits scale very well. With other, older, classes... the benefits are not so cut and dry anymore and with everyone having some of the same drawbacks, benefits are what a lot of people are seeing.
i just hope this kind of very detailed, very well thought out and presented testing will yield some results in managing the pro's and con's for each of the tank classes to get us all around the same point. i hope that comes in the forms of uplifting the down trodden, but suspect it is easier to scale one or 2 down than others up.