avk, I bought into it only as an innocent bystander.
Blitz (and all others), OK, OK, I understand all this theory mumbo jumbo (unfortunately, I make a living at trying to fix crap that engineers dream up) about the series circuit and anodes and cathodes, and lions and tigers and bears, Oh My!
Me thinks it would work in parallel as well due to decreased resistance of the plug gap on the combustion stroke, but I have to bow out to the pocket protector & RPG/BCG wearing geeks on this one.
But remember, these are the same guys that put the parking light switch on the steering column and the drink holder in the perfect spot next to the climate controls and above the radio, supported slightly enough to bounce around a can of Coke so that it will completely disperse its carbonation in a few short minutes.
Better break the microscope out to see the deposits tho, at least on mine. I just changed my regular old AC copper plugs out after almost 30,000 miles and didn't see any NOTICEABLE difference in them. Anyway, and theoretically of course, if the deposits go from one side to the other, then the build-up and tear-down should result in the gap staying the same.
However, the extra acceleration and power I didn't feel with the new "platinum quad-spark dilithium crystal super high output beryllium coated superconductor center core plugs" I installed really put the hurt my neck during the test drive, and my gas mileage went from about 25.220 mpg to 25.255 mpg...
Satirically yours, Tiny