It is likely that ANY plug may have worked.

Plugs fail for a variety of reasons, and the fact that it "glowed" is almost meaningless.

The wire is plated/alloyed with platinum (or rhodium) to act as a catalyst with the methanol in the fuel. Many times, a plug will be corroded/carbonized through use and simply fail to function correctly even though it "glows".

So...before you all run out and buy a gross of Tower plugs....

'Race