I may be missing something, but the only evidence I've seen points the Songhai still being a progression from Egypt, not being replaced. Every civ needs at least 2 progression options for it to be a functional choice, and for Egypt those are at least Abbasid and Songhai.
They may get replaced with something more logical, but that would be a very odd and risky way to tease things pre launch. Why would they drop songhai only through a civ progression as part of a civ progression that didn't actually exist in the game? That wouldn't get people excited, that would just meaninglessly confuse and frustrate people.
It is risky and odd, I certainly don't deny that. It started the whole marketing campaign on a really rough foot, diminishing player trust in the game.
To which I ask, why are they even making this game if it's going to look as janky as it seems right now? Why would they be running with this at full confidence, weekly measured reveals, two Pax Panels back to back, Shawnee stream? Why is everyone so confident in a game where Amina leads Aksum? It makes no sense.
No, what makes more sense is that they deliberately threw out a few illogical teasers to keep people guessing. So that we can get a lot of "aha!" surprises when things start to make sense.
So where have you seen that Songhai no longer progresses from Egypt? We know historicity isn't the only criteria fro succession, its also approximate regionality. This is why we've also got Rome to Normans. Africa is historically underrepresented in civ and there's no reason to believe that will change yet beyond your hopes. But the evidence we are presented with runs counter to that.
Nothing about this says logically coherent so far. They've put Khmer in antiquity, and the progressions we have seen have been huge stretches, which is inevitable when you launch with limited civs. You are going to be disappointed with this logic you're using, as this is no longer a civ game in the way you are hoping. Continuity and historicity is not the priority with this mechanic, gameplay is.
In the initial Egypt reveal, Abbasids were
not Egypt's preferred civ. It was listed as Songhai. Everyone was up in arms, everyone was assuming Egypt -> Songhai, and even more convinced then than now that the game wasn't going to make sense. And then the Abbasids were revealed, everyone breathed a sigh of relief, and we all went about worrying about other things like Amina leading Aksum or Rome into Normans.
Khmer in antiquity is perfectly fine for what they are doing, especially when, as is likely, Khmer gets a Funan leader in DLC.
And you are totally right, the game may not turn out the way I think. I won't be offended if it isn't, I just won't buy it. The speculation process has been fun either way. But the reason I have been making all these posts is that I truly think I figured it out. Leaders still have associated "civs," just not in the way people used to think of them.
Also, I haven't produced a competing version in this thread already, landing at 36-40 civs that makes sense using logic we know about!
No offense, but that isn't a vision so much as a running list of vague ideas. A good number of civs are still missing from your pathways. Your idea of "pathways" seems to be based on the slideshow presentation and not the actual game interface that we've seen. And you haven't accounted for how leaders contribute meaningfully to these civ selections in any way.
Let me say, kindly, that a game like that would not make it to market, let alone sell well. It would need a lot more work.