Eight hundred million years later, I’ve finally read through this whole thread. My apologies for the wait! All in all, you made a pretty good summary! There are some details that conflict with the ones I’ve gathered, but the overall idea seems good - especially considering how much wasn’t set in stone yet. If you ever wanna compare notes, feel free to PM me. I think we may both be able to find some details we missed if we help each other out!
Also I see somebody linked the shredder stream you sourced. I’ll go look at that this weekend and see what I can find.