TL;DR: In 4-4-2, revenant is missing buffs, which I believe makes 5-4-1 closer to favored.
A major point of confusion I had with Nike's post (and a sentiment I saw echoed on reddit by Fennec who probably knows more than I do) was the 5th point of the description of the meta:
"Revenant plus Assassins/Berserker Mesmer > Commander Mesmer + Elementalist in term of total raid DPS."
According to Nike's post on reddit, this conclusion was made in the following way:
"Used standard DPS golem #'s published by [qT] as well as our own observations."
I think this overlooks part of the revenant (and mesmer) experience in the 2-player group, which is that these two players are at a disadvantage in terms of receiving many of the raid buffs that justified the usage of 4-4-2 or 5-4-1.
The idea behind 4-4-2 is that these important buffs are applied to high damage elementalists (or other classes) with near certainty. These buffs are so powerful that it is better to have them with high probability than to have more high damage characters relative to offensive supports.
However, these important buffs can easily miss revenants in a seperate sub-group.
I couldn't find numbers for a lot of these things on the wiki, so in the following I assume that Spotter/Empower Allies auras and Spirits/Banners buffs target 5 players including the ranger/warrior that cast the spell. I couldn't really find any good sources on this but the numbers are easy to tweak. I also assumed they prioritized party members, and I assumed a standard dps burn scenario in which players would all be in range of each other, such as Gorseval or burn phases on Keep Construct.
The first two parties both receive all buffs with 100% certainty in this case by virtue of being in range of each other and party prioritization. For the sake of this post, we can assume that spirits/banners will always be up as all existing bosses exhibit periods of invulnerability that would complicate analysis much further if this was not assumed. I also assume a random arrangement of party members, that is, that there is no coordinating of position in order to prioritize buffs.
The revenant can only receive spill-over buffs from the two main groups, and only one raid member outside of each group can receive buffs from that group.
Consequently, of the 6 raid members eligible to receive spill-over on spotter/spirit/empower allies/banner, the revenant fails to receive these buffs from each party with probability 5/6 (~83%), and therefore fails to receive buffs from both parties with probability 25/36 (~69%). This is a fairly significant loss in effective power and could be worsened further depending on Grace of the Land prioritization, which is unfortunately not a mechanic I believe to be well understood.
We can probably assume independence between spotter/spirits/empower allies/banners and 100% correlation between banners as warriors will likely place both banners in the same location, meaning that the probability that all buffs are received is 11/36 ^ 4 (raise to 5 for independent banners) which is only about 1%, whereas we can expect an third elementalist (or other damage dealer, such as dragon hunter) to receive these buffs with 100% certainty in a 5-4-1 scenario.
Some further data:
0 buffs are received ~23% of the time (25/36 ^ 4 * 11/36 ^ 0)
1 buffs are received ~10% of the time (25/36 ^ 3 * 11/36 ^ 1)
2 buffs are received ~05% of the time (25/36 ^ 2 * 11/36 ^ 2)
3 buffs are received ~02% of the time (25/36 ^ 1 * 11/36 ^ 3)
4 buffs are received ~01% of the time (25/36 ^ 0 * 11/36 ^ 4)
The expected number of buffs received is ~0.3.
These are fairly easy to adjust depending on the exact mechanics of buff application.