So it turns out I was mostly right with my guess before. Kusanali was kind of an offshoot of Rukka, but not the same being. Kinda weird that they used "branches" to symbolize this instead of seeds, but I'm sure it's related to something we'll find out later about Irminsul. I was also right about the "world forget me" thing being related to Rukka and the black slime (forbidden knowledge is now the official name for it). Also, I guess my original idea forever ago about Alhaitham being a Dottore clone was wrong, but I had moved on to thinking Alhaitham is a homunculus like Albedo anyways, which I still believe. He shows the same kind of obsession that Albedo does, and they both have the throat gems.
Interesting stuff about the 'sibling' being from Teyvat, and the Descenders. Wish they'd expand on it a bit, but still good stuff. I wonder if that's so they can have the siblings make an heir later without incest being involved. Shit's gettin' weird in Teyvat.
Also, here's my estimation of what an archon looks like when they don't give up a Gnosis to an enemy that JUST tried to destroy their nation, for 5 minutes:
I thought it would have been a big plot twist if the info that Dottore gave Kusanali at the end was more forbidden knowledge (which sounded like it actually was?). It doesn't seem that Irminsul got corrupted again immediately this time though, so maybe it wasn't THAT forbidden knowledge?
I could have done without those fetch quests to get everyone to the grand feast that happened during a black screen with the words "And everyone had a great time, trust us". Mentally ill lesbian shippers are gonna have a field day with the Dehya "my lady" stuff. Expect awful tumblr fanart on reddit within the next 2-3 days after they finally press enough buttons to beat Scara.