After looking at the answers given sofar my guess would be:
1 Crimean Khanate
2 Egypt
3 Kingdom of Naples and Sicily
4 A Berber civilization in North Africa
The post you are quoting is part of a guessing game. Some guesses are very precise and some are more vague. This one is more vague. I could have said Tunesia (There is a big empty space on the map right now over there) but they are already present as a Cordoban respawn.
No way I am able to guess all four of them. If I guess three out of four correctly I would be pretty pleased with myself.
Maybe there is a way after all
Crimea, Egypt, Sicily, Tunesia.
A quick reasoning why I chose these:
Crimea was already mentioned in one of the other threads. It's inspiration will be the RFCE++ civ, it was very fun and unique, great for gameplay.
For the rest: I hate all those "respawn civs". It's not even an 1/10th solution, just makes everything worse in most cases. Also in the case of Egypt it's not even implemented on the already very low Hafsid/Tunisia or Sicily level.
So the respawns of Cordoba, Aragon, and Arabia will be made to full civs instead.
There are way too many thing related to core area in RFC type mods, most of which can't really be properly added for a second core area without a major rework of many basic functions.
IMO respawns as different civs only works well in DoC too, if it roughly happens at the same area.
And then there is all the art, uniques, etc., which are totally out of place most of the time. Not to even mention the missed opportunity to have a respawn of the original civ.
@The Turk @Swarbs
I don't want to get into the debate related to Egypt and Arabia, sources and the Caliph title, it got a little out of control.
I will strictly concentrate to the more general questions:
My opinion is closer to Swarbs', as in gameplay triumps here. If more solutions can be justified historically, we should aim for the more fun UHVs.
I find it more than feasible that the Mamluks would go after the Ottomans to some extent. Even if it's only partially correct, it sounds great for an ahistorical UHV. Especially with the setup of the mod, where dominance above the Levant won't be that hard after the Crusades are over.
Also, about the spawn: while it would be great to have conquest spawns, it's not really feasible for the reasons metioned above. 2 different core areas - one in Egypt, and one in Ifriqiya if the conquest fails - would lead to many strange situations. I would prefer to spawn them after the dynasty established it's core in Egypt, even if it was a rather unlikely outcome in real life. This also gives us better options for the early Arab UHVs, with a bigger gap in the timeline.