I'm more trying to figure out where the OP's ranking is coming from, and what in the books supports it, because in my reading of the books I don't see a convincing argument to backup his breakdown.
Since I wrote up the power-rankings of the plot-device level folks, here's my thinking in three different flavors.
1. Mab speaks of Uriel with respect (as more or less a peer, from my reading) in SMALL FAVOR.
2. Uriel works for the Almighty.
3. The Faerie Mothers are more powerful (but more constrained) than the Faerie Queens as noted in SUMMER KNIGHT.
These three facts lead to two power comparisons:
Almighty:Archangels::Mothers:Queens
Really, the more intresting debate here is "are the Mothers equal to or greater in power to the Almighty?" because the Mothers already outrank Mab in sheer power.
So, I made a first cut with a rough ranking:
A. Almighty
B. Mothers
C. Archangels/Queens
Taking another angle on things:
1. We know from Lash that Lasciel was around when the universe/multiverse/anything that's not outside the Outer Gates was created from the void.
2. Lasciel was just an angel, outranked by Archangels, outranked by the Almighty.
3. The Faerie Mothers are somehow involved in maintaining the natural order of the universe. Therefore, they are part of Creation.
4. I assume that the Creator is more powerful than the constituent parts of Creation.
(Though a good debate can be had here, too, on point 4 -- is an automotive engineer more powerful than a car?)
To take even another angle, the more powerful an entity is, the less mortals seem to directly interact with them, face-to-face. Harry's chatting with Mab all the dang time, not so much with Uriel, once with the Mothers, and no one we know of has had a face-to-face the Almighty.
Lastly, it's called
THE ALMIGHTY. That's "all mighty." (It's what it says on the tin.) Would Mab ever refer to an entity that way in comparison to herself, even with a big sneer?
In all cases, Mab is apparently not on the same level as the as the Almighty.
So, barring a tvtropes-esque Word of God from Jim here, I'm gonna come out and say:
The Almighty > Mab