Believe me. We threw the book at it in a car wash parking lot til we absolutely couldn't anymore. We did eventually get the car started and I put several miles of driving on it to "bake" out any residual, went to my house, shut it off and...dead again. So I made the call at midnight to wave it off for this year.
It's in the wiring somewhere because once running the car ran absolutely great. It has stored permanent codes for crank/cam correlation, cam sensor, evap purge, several communication issues, etc from either battery swaps, jumping or the wiring issue itself (this is what I'm banking on due to nature of the codes)
I'll be diving in more later today. Checking the motor to chassis grounds primarily and also cleaning off the starter mating surfaces so that body is getting the best ground possible and retry. If I had to bet...I'd say it's the bellhousing one so I'm gonna get the mirror out and look.