I understand what you are trying to do now. That is a lot of work for a little safety. You also are wrong. If you disconnect the ground to the battery, the electricity will not make I complete loop and you will not have power to anything. The reason why you put a switch in the negative side is, an alternator can complete the circuit if it is running. So you are going to run your alternator and power feed wires all the way back to the battery? That would be less safe than running one heavy cable to the starter. You do what ever you want though. I like seeing someone trying something different.