Thats fine for a brushed motor where there is only two wires between the esc and the motor .. but for brushless I was told by an old Electrical Engineering type's ( You know the type .. the guy you go to when you need an epromm programmed ) that the cheaper esc's might have skimped on the isolation circuit and removing one wire isnt enough to be 100% sure that the motor wont start. Something about a sensor motor vs sensor less motor and the stator coil sending a feedback signal and it being picked up out of phase and causing the motor to just spin up to max rpm with ANY throttle input. I really didnt understand it all but the parts I did understand sounded plausible and for me there isnt any downside to unplugging 2 wires .. Worst case is that you have to reverse the motor and I already know the behavior of my heli with the motor reversed so I can detect and correct it easly.