That might be mine as well, https://medium.com/@raphlinus/towards-a-unified-theory-of-op... . It's very much unfinished work though. Certainly wrapping my head around the OT and CRDT literature took huge amounts of brainpower exertion, comparable to what I did for my PhD.
Also, I have your essay in my queue to read more thoroughly, it's high on my list of stuff to study as we possibly rethink the way this stuff works in xi-editor.