Yup,I read through the instructions.
All I can add is that ,if it was dropped on my workbench,I could have sorted it out while being on the stopclock.
For now,I would ignore the fact that they individually worked ok.
Is there a better way to disable the BEC? or not have the main batteries to power the ESC circuitry
That depends on where the switch is connected and what bec component is used.There are ways of finding out but have you got the inclinationright now?