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The spark is going somewhere when the high voltage spike comes out of the coil. It takes the path of least resistance which is (hopefully) jump the SMALLEST gap from the rotor tip to one of (in our case) four evenly spaced contacts. The odds of the spark jumping the gap 80 degrees (say about an 1" away from the rotor tip) to left verses the one 10 degrees to the right (1/8" inch from the rotor tip)...astronomical. It is all pretty much a moot point anyway because of the width of the rotor tip electrode anyway...I would bet it covers 70% of the potential movement of the dizzy.
When the high voltage pulse occurs has no connection with the distributor. Which spark plug wire it ends up in, does.
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