The path doesn't include but one plug at a time (on this engine, (several engines have a wasted spark on one plug of 2 firing at once from the same coil) Thus there is only one path for volts. All open gaps in the spark path are additive. Thus if the rotor gap (as below) was 1500 volt and the spark plug in fuel and air was 6000 volts, it would take 7500 volts to jump. If the leaking plug's fouling was draining at 1000 volts and going to ground, the total would be 2500 volts and never jump the real plug gap. If an added gap forces 7000 volts to jump it, the plug will now get a zap of that voltage plus the rotor gap 1500. 8500 volts now does jump the intended gap and the plug fires. Jim
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