Nice guide man. Got a few comments regarding your specs though. Just some min-max things that I hope helps the guide.
The MT/MT2 spec. Improved heroic strike (2 rage saved) over 2% crit from cruelty. HS is only ever used to rage dump in excess rage situations as you know, while 2% crit is beneficial for every single situation for MT/MT2, including in rage deficient fights. My suggestion is
[7/5/38] with 1 talent point to invest anywhere.
The offtank specs. Giving up improved 1H spec on offtanks is no good, they need it in any fight when they need to tank adds or threat generation for vael/razor/brood/chrom and the expense for the luxury of improved demo shout which is not needed in this content, or even AQ40 I might argue. 3rd spec gives up 10% armor loss on offtanks for 5/5 imp demo shout. 10% more armor gives damage reduction mitigation for every single combat situation that does physical damage, which is nearly all except a few mobs in current content. Versus imp. demo shout. For reasons mentioned above, it should be a no brainer which is more effective.
The Impale spec you linked is a bit odd. 10% armor loss and 2 seconds on shield wall vs 10 defense and 2/3 imp. SA? With proper Defense kits, T2 and ZG gear, the defense cap will be reached. However, you don't need defense cap, really. 5-10 points less is fine at that level imo.Once again 10% armor reduction is a huge loss, as it influences physical damage reduction on nearly every single fight. Whilst 10 extra def fluff points is a risk reduction of crit chance from 0.4% to 0%. An occurrence that is really only fatal on Broodlord or Nefarian warrior call. 0.4% chance of dying in those 2 cases. I would recommend
this spec with BiS gear and once ZG is out.