In order for the FQIS to have been Flight 800's ignition source, a transfer of higher-than-normal voltage to the FQIS would have needed to occur, as well as some mechanism whereby the excess energy was released by the FQIS wiring into the CWT.
Therefore, in order for the FQIS to be the ignition source, a transfer of higher than normal voltage to the FQIS needed to have occurred, as well as some mechanism whereby the excess energy got released by the FQIS wiring into the CWT.