Here's my thoughts from the measurements in the link.
1. The two pairs SHOULD BE either A-B and C-D, adjacent, or A-D and C-B, Inner/Outer.
2. At least one on these pairs MUST BE full pack voltage.
3. B-C gives the only close reading, 44V, reasonable for a partially discharged pack.
Now, that leaves A-D, which gave a dramatically different reading. Contrary to the posted musings, batteries almost exclusively have only one output reading. A switch output might have low-amperage wiring, but should have been at the same pack voltage. The same should hold true of any sort of output port.
That leaves only an input port.
I do know that various BMS will give readings, at the input port, that differ substantially from full pack voltage.
I find myself idly wondering what exactly happens if you connect the output of the battery to the charge port. Slowly run dead, I guess.
Currie never used any sensors of any kind on either battery or motor, within the documented years, that I saw.