There are 7 fire starter lines. 2 of which can be debated either way as being part of the zodiac. So they cancel each other out, essentially.
That still leaves 5 that do fit the zodiac theory. That, to me, is too much to be a coincidence. I do think there is some truth to the theory, but the biggest thing that would out right confirm it is if the 8th gen fire starter line is one of the remaining ones. If it's a horse, or a ram or snake, etc. There shouldn't be anyone denying it anymore after that.