it's not battery to the motor it's motor to battery...
Why would electrons need to flow through the esc to go back to the batteries? ESC just needs to control electrons going in (negative)
All reverse is set up with 4 wire leds from esc and highend forwards are set with 3 wires.
the positive wire from esc to battery is to get rid of electrons that ESC used and the positive wire from motor is the circulate the electrons the motor used...