Your theory sound good until the baseball bat with bloods does not make sense and all the unnecessary bloods spills all over the bedroom and bathroom if he’s so wise as to already killed her before entering his home.
Brendt Christensen, quoted in that full transcript saying to his wife
Much implying he wanted remembered in history and not forgotten away easily either in cruelty or evilness, so killing ZYY early on would not help in establishing his own legacy crime scene murdering. And by giving up ZYY body location when the trial is over he would quickly be forgotten after the case closed and solved as another murdered crime with a twisted mind. He wants to top that of Ted Bundy. To avoid and holding onto his own created legacy, he would need at all cost to hides the location of her remains a secret only to himself while the world kept questioning and ponder where he could he possibly hid her body years later after trial closed.
The transcripts also gave many invaluable insights on how he initially wanted to commit his sick-twisted fantasy quoted below,
Brendt Christensen, quoted in full transcript below reason for buying a duffle bag & related.
That really led me to believe he carried most of his plans out on ZYY as he’s described online! Most likely she’s been gag to keep quiet and put inside a duffle bag in be carried into his home.
What puzzling me most is how he’s able to disable her so quickly, like within minutes because IIRC, on that 2nd security video while the black colored Saturn was driving away from the camera we could see no sign on ZYY on the passenger side; either there is some time gap delayed from what law enforcement want us to see/know or something else happened in between caused several minutes delay of footage in that video to give us any clue.
Anyhow, this is personal from someone who has suffered somewhat of depression, my instinct tells me, he would like to hide her remains so someday he could come back and revisit it.
The graveyard immediately came into my mind. I remembered someone previously wrote he told the police officers he drove past by the graveyard when questioned, I wonder if that place if its near a place he frequents visit driving around his home?
It would not be that hard to just dug up a small hole and bury just ZYY head/skull as his trophy like Ted Bundy did to some of his victims displaying their severed heads at his home.
My other insane theory is that like a copycat of Ted Bundy that he chooses to devour some of ZYY flesh to as to have some form of god power mental thing over his victim’s. Again, if he just buried the skull and skeleton, would not need a big pit to do it. Burying it at a cemetery is also the least expected place to find a buried corpse out of randomness in the open. Ordinary people’s would think corpse and bodies exposed at cemetery would not raise much eyebrows of when discovered unexpectedly randomly.
Just my opinion to the case.
Ps. About his 13 kills also seem bluffing numbers to me to boast to his girlfriend implying he has started killing at 19, meaning he has killed at least once a year until he’s now this age to try to impress her further. And this my third account on this website thru the years kept forgetting my pass.