I'm pretty certain that the Hakas were condensed before OblivAeon was defeated, because they note that the best chance at killing Haka was when both of them where in the same place: fighting OblivAeon.
My confusing stems from the ARG. Didn't the PW fight the XPW shortly before OblivAeon?
That’s occurred to me too, but I feel like that’s in the same category as Eternal Haka, which is to say, “um.” With a side of “that close to Oblivaeon, things go sideways.”
There is the possibility that XPW Haka isn't Arataki Wakarewarewa.
I was assuming it wasn’t. I mean, XPW Haka is male, so.
The thing is, up until Tuesday, I would have just said “it’s an alternate Haka.” Except now we know there’s no such thing except Arataki.
XPW Haka is definitely Aata. Arataki is a woman from another reality altogether. This is very clear from the podcast.
Come on, guys! All you need to do is add three or four extra temporal dimensions while thinking about this and it all makes perfect sense! This should be easy! 
But then you need to use the pluperfect flawed sense for the cotemporal and the postectve dimensional tense for the secantemporal and this is why grammar gets annoying…
Hey, I'm gonna add more confusion and a lack of understanding to this!
The whole thing with the XPW and Eternal Haka thing is that alternate more than 2 versions of Haka exist... for a time. Remember, time doesn't run "linearly" when we're talking about the multiverse. Just because Eternal Haka's calender says he's in the future, his point in "space time" could be in 600 years in our past. I also think there was mention of him existing and "then going off to be absorbed" when the question of how did he meet the heroes came up? I might not be remembering correctly.
All this to say, I think the alternate dimension versions of Haka HAVE to exist by the nature of alternate dimensions, but eventually they don't. We may have more revealed when a certain pirate villain-turned-hero who has shown the power to destroy timelines on a kickstarter update has their own episode (or someone else if I'm totally barking up the wrong tree).
This is from the notes WalkingTarget on it
I asked a question immediately after the episode based on the episode about the multiverse no longer being "travelable", given the above information (thanks WalkingTarget and Powerhound_2000 for making it easy to reference) something must be able to move between realities to check/power up the Hakas, even if it's just energy. Couldn't someone use that to track or possibly communicate with other realities?
You know, rereading the stuff from Walking Target, I think we're looking at this slightly incorrectly.
I've been picturing this "collapse" of alternate Hakas into Aata as as nearly instant. BAM only two Hakas exist. But, that isn't what they are describing. They're describing a much slower proccess, a gradual drain of Haka into Aata and Aatawari instead of a collapse. This explains how XTREME Haka and Eternal HAka can still be around. They have absorbed other Hakas, but they have not yet been absorbed themselves because they are so close to the wall of the funnel.
And, while the Oblivaeon fight is the catalyst for the entity to do this thing, they must go back 600 years to actually do the thing, which because time shenangins could have happened nearly instantly even if it took them a long time to get the proccess and work it on Aata.
For me the funniest thing about this whole story is that, if Haka gains his (hers) powers from the fusing of all the other haka - where do the powers of these other Haka come from ?
This said, it all makes sense if you remember that this is a story told in another universe by authors trough the years... When the OblivAeon story explaining Haka's power was published, it was because an author decided that it was a fun idea to retroactively explain Haka's power by something happening now. Nobody prior knew it would ever happen, and so there were other powered Hakas everywhere.
In other words, the OblivAeon authors retconned the whole history of Haka, creating gordian plotknots in the process - but, waow, it was a cool idea.
As for the tactics/RPG timelines and Ataa being in the Tactics one : remember that, as Christopher explained, in the "author's universe", the Tactics timeline was published long after the RPG one : the RPG one is the direct continuation of OblivAeon, at least from a publishing point of view - so Ataa Haka ended up in another timeline, lost for good for years to the readers. (I guess the idea of seeing Ataa again was a selling point for the Tactics books!)
Timey Wimey can already be cause for headaches, but if you add russian dolls universes, with Christopher and Adam in our universe, imagining that in another universe a comic book about another universe is published, and try to explain this last universe itself without refering to the two higher level ones, trying to make sense of things can break your sanity and lead you to the Cult of Gloom's next swamp grill party !
I mean, you combine fifty dudes lifting a thing, that thing will get lifted even if any one of them couldn't lift it by themselves.
Also, Highlander. Or am I thinking of that movie with Jet Li that I never saw?
And this is Haka we're talking about. Before his Ta Moko disappeared (which I believe is likely the point where he gained his powers), he was a already close to the Maori ideal as a cheif.
No, what I mean is : Haka became an immortal warrior because of the "fusing" of all Hakas/Ataa. Ok, so far so good.
But the other Hakas we know (Eternal Haka, for instance) are ALSO immortal warriors in their own timelines. With the same powers as "our" Haka. The fact that we know that, at least in some timelines, other immortal Hakas existed makes the explanation behind the fact that the immortality of the only two "true" Haka comes from the fusing a paradox.
Well, it depends on how the 'fusing' works. If the fusing happens sequentially, with the spell (or whatever) 'feeding' Hakas to the main two Hakas one at a time, then you are right, it doesn't make sense. But it would also be horribly inefficient. Instead, you could do a binary fusing, where Hakas are paired and fused, repeat until there are only two left. This would go much faster. Also, it means that all Hakas would grow in power (up until the point where they get fused away) rather than just the two final ones.
This idea of combining the power of multiple people across the multiverse reminds me of a Jet Li movie. Don’t remember the name, maybe The One?
Yeah, that's what I was thinking of!
I mean, to answer this question, you need to ask things like "What is power?" and I am just not good at philosophy. :B It makes sense to me that if you combine two guys, those guys will get stronger per their own natural traits, and if you combine thousands and thousands of guys, those traits will slowly add up to superhuman proportions, because that's a lot of dudes.
This is what I was trying to picture with my funnel analogy.
There are other powered Haka's "earlier" in the meta-timeline because those Haka's were also gathering points for the energy of Haka, which then collapsed further into other Haka's who had been gathering power, until we were only left with 2 Haka's in totality.
I just didn't know how to look up the name for what I was picturing which is a slightly different picture than your explanation of Binary Fusing (which is probably more accurate) gives me.
I hope most of these questions get answered when we get to the "How" from whoever did it (I'm also assuming La Comodora here, since she's the most likely to be able to as well as being this month).