Reversed coil polarity requires at least a 10% higher voltage to fire the spark plugs. It's easy to demonstrate that on an oscilloscope. The polarity is affected by the common connection point where the primary and secondary windings intersect, and there is a definite difference in performance if a positive ground coil is connected backwards. Theoretical guesses are great, but those of us who have dealt with the real world of working on these things for over 50 years have seen what actually happens if they're connected incorrectly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!