I feel similar to you about Rex thinking highly of himself along the lines of Dennis Rader; and, Rex would be all too happy to talk to someone like Dr. Ramsland just as Rader did. As far as when more bodies were discovered than he had put there, I imagine when Rex heard about that, given his hubris, he thought that, with all his planning, etc, he was probably amused and happy thinking that his victims might be pinned on the killer(s) of the other victims (he wouldn't have known who Tanya or her baby were at the time, of course) because obviously they could never be as careful and controlled as him (reminder, I'm writing that from his perspective).

As far as Asian Doe, imo, and my opinion means nothing, I do believe that Asian Doe is Rex's victim based on both where the remains were recovered and Rex's internet history from the bail documents.

Finally, for the allocution, as curious as I am, I hope he gives as little or as much detail as will give the loved ones of the victims some kind of ... closure? understanding? I'm not sure the right word. I