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There may be some truth in the origin of swapping the wire leads from 1-4 and 4-1, and 2-3 and 3-2. (That is what is being discussed isn't it? It got a bit hazy for me.)
Any waste spark ignition system will be firing one of the spark plugs in each pair from tip to ground and the other from ground to tip. The spark plugs erode accordingly.
It is easier to fire a spark from a sharp point or edge, such as from a nice square spark plug tip, than from a rounded, eroded surface.
If you have car with spark plugs near the end of their useful life and swap the leads, the direction in which they fire is reversed and there are fresh edges for the spark to jump from, improving the ignition.
Maybe not, but does it make sense?
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