[Al Skierkiewicz]

Avery,
The internal circuitry of the either the Victor or the Jaguar switches between the positive and negative leads of the battery. The switching is not synchronous (meaning all devices will not go high at the same time, etc.) so it is possible and likely that two controllers in series would allow the series connection to have one wire at +12 volts while the other is at zero. The result would be catastrophic with max battery current (600+ amps) flowing through both controllers and the wiring in between. The same holds true for controllers in parallel. That is why the rules allow one and only one controller per motor. At full throttle on either controller, the output goes to DC (no PWM output except for a short pulse on the Jaguar) and so there should be little difference between the two types of controllers. The Jaguar uses a 0.0005 ohm resistor for current sense but the FETs have a lower "on" resistance than the Victors so it's pretty much a wash.