Pre 4.1 I would use AMZ on Heroic Chimaeron, and it'd take the bolt for 7/9 people getting hit. Looking back, I realized that Chimaeron doesn't shoot 1 bolt, but 2 and that's why it seems that not everyone gets the damage reduction at the same time but they do for one bolt, and the second bolt kind of hits half the raid or something, not too sure. But yeah it's been in for a while and why a 4/1/36 spec is the best raid spec despite having a bit less dps talents.

There's no way Blizzard would have the 2pc tank count for two extra diseases. Even having Obliterate/Scourge Strike act like they had an extra disease would be pushing it for a 4pc DPS let alone a 2pc.

This is definitely incorrect.

Forget the disease aspect of tank 2P T12. That part is undoubtedly worthless, for any number of reasons. Simply look at the dot aspect - it's 400 dps with, what the wording seems to hint at, a 100% proc chance. That is nothing to scoff at and it's unquestionably stronger than dps 4P T12 (which is plain horrible - our crittable damage is small enough to begin with, but then the phrasing of the bonus explicitly excludes Death Coil and disease crits, leaving only the physical portion of SS and FeS benefiting).

Say we're doing something like 30k dps average (a ~20-30% boost over our present output) in t12 which, barring any changes and merely accounting for the improvements in gear, is probably a pretty accurate overlook (if anything that's slightly optimistic, but any overestimation in our average dps means that reality would then favor tank 2P even more than dps 4P, since the latter scales with our personal dps while the former does not). That means tank 2P is worth 1.33% dps. The physical SS and FeS account for about ~17.5% of our overall dps (25% of our personal dps, if you're looking at a parse, but that's merely 25% of the ~70% coming from us and not our pets), so for dps 4P to overtake tank 2P, we would need for about half of that 17.5% damage to come have been from crits, which would require a 33% crit rate - something we don't have nor will we have in the next tier even in full best in slot.

Of course, yes, we will have to take a slight dps hit from the less optimal secondary stats of two tank pieces instead of two dps pieces, but between reforging and the near-certainty that there will be at least two tank pieces with either hit, mastery, or expertise as one (or perhaps both) of their secondary stats, it should be a very minor hit so long as the strength is equal (as it historically has been), and considering our crit rate with SS/FeS come nowhere near the 33% break-even point, I feel very safe in saying that, based off what we currently know, dps 2P T12 + tank 2P T12 will easily best dps 4P T12 for Unholy.

All of that isn't even to mention that fact that tank 2P T12 can scale in AoE situations (simply by the player tab-autoattacking), whereas dps 4P T12 does not and can not.

Along with the slight nerfs to frost, this may push Unholy back to the top of Death Knight Dpsing. Thoughts?