Regarding using the legendary 1.8 MH dagger vs normal 2.6 MH:

It is my understanding that the damage Main Gauche inflicts is normalized to a 2.6 speed weapon.
The chance for it to proc however is not, so a faster MH will proc Main Gauche more often but inflict less damage every time thus theoretically making it MH speed independant.
The energy gained from Main Gauche via Combat potency should scale with speed however.

I did a few pretty long runs on a dummy naked with just different mainhand weapons and the number of MG procs and damage inflicted per proc are consisted with the description above. However the MG energy gained via combat potency did not seem to scale with weapon speed?
Have anyone else seen this or is it maybe a fluke of too short testruns on my part (5k melee attacks)?
I will try to rerun the tests for a longer time.

Yes, No'kaled seems like a solid upgrade from using Fear. During Ultraxion progress, our rogue with normal version axe was beating the other two by 2-3k DPS, most of that being the proc.

Furhtermore, I did some personal investigation in the logs at the same time, and concluded that the rogue with a 2.6 weapon did roughly 900 more DPS with Instant Poison on average over 34 tries. Doing some dirty inaccurate math I estimated that it would be roughly a 400 DPS increase to use the 391 mace from Firelands over Fear. The night after both rogues who switched from Fear to Firelands mace saw a 500-1k DPS increase, part of it probably being because of better tries through progress but also part being that using a 1.8 weapon instead of 2.6 loses something that isn't compensated for by the 45% damage increase for SS and RvS on Fear.

Look at post #814. After receiving my axe off madness of deathwing i did some testing and posted results in that post. Basically what it concludes is the 403 axe off madness is a DPS increase over Fear. Now come the second stage of the daggers i'm almost positive that will change.

It is not. Using a dagger MH you will get more mg procs from autoattacks, the same number from specials, and they will all hit for less. Less damage, more combat potency.

Whichever one is doing the most dps when you cast it... During burst phases, probably a fury warrior or arcane mage. During steady phases, whoever generally tops meters.

Unlike buffs like Dark Intent, TotT does not synergize with anything; it doesn't work better on dot classes, it doesn't scale with haste, it doesn't scale with anything. It just provides a flat % dps boost. Hence, the person doing the most damage is your obvious target.
Incidentally, this also means you shouldn't necessarily cast it on another rogue if there's one present. As long as the tank has no trouble keeping aggro (which he shouldn't) you should forego the rogue for whoever is topping the charts.

I've always heard that it's more dependent to put on a more sustained class rather than a proc based burst class.

The argument is coming down to, a Ret Paladin is arguing that it would be better to toss on him over the Frost DK or Fury Warrior doing comparable damage.

From my understanding, TotT isn't going to affect a Ret Paladin who could get CD locked with no procs as much as it will a DK or Warrior who don't have the problem nearly as much.

If I'm wrong, then I'm wrong. I've been wrong before and I'll be wrong again. It just makes sense in my head to give it to the person that is consistently sustaining rather than the person who is at risk of being RNG fucked. Now, granted if the Ret Paladin is like 5% ahead of the others, it makes sense to give it to them, but as long as it's a 1-2% margin, my brain tells me to give it to the non ret.

Your not hitting your buttons fast enough, you should hardly ever energy cap. If it hurts your fingers to spam buttons that quickly then either switch specs as you mentioned or drink something with electrolytes as it will help your finger joints / cartilage.

Incorrect.

I'm close to 2900 haste and energy capping during AR/Matrix-proc is just going to happen. The important thing is to use as much energy as you can during those times.

Yeah, energy capping is definitely an issue in this tier from the higher haste, trinkets like [Starcatcher Compass], the 20% energy reduc from the 2pc, AD, heroism, KS, the DW encounter aspect buffs (not sure how the haste buff works exactly) and any other haste-related buffs I'm probably forgetting.

In a perfect world Blizzard would just buff damage and slow down regen to make Combat more manageable.

Would it be plausible to add heroic No'kaled into the BiS-list in the same way that you've listed Electrowing Dagger, or do we not have enough information about the weapons for it to make it to the list yet?