In general, I don't like any fan theory where the arguments are so abstract and tenuous that it becomes unfalsifiable, like there's literally nothing that could dissuade the most hardcore Chinese Zodiac truthers at this point. The next Fire starter could be a blob of petroleum jelly and they'd convince themselves that it represents the horse because petroleum jelly --> jelly --> gelatin --> the common misconception that we get all our gelatin from horse hooves.
Ultimately it's harmless, and I could imagine it being fun if you just treat it as this increasingly challenging thought exercise, but there are people who sincerely believe in it and I reserve the right to find that a little embarrassing.
This is my point, really. At this stage nothing will dissuade the believers. But people get ridiculously aggravated trying to disprove it and I'm like... seriously why bother. If we ever get to Gen 13 then it's disproved by default.
It's like the water starters=weapons theory, which to my mind has even less evidence. Blastoise is cannons, yes, Greninja is throwing stars, yes, Empoleon is a trident, yes, Samurott is swords, yes, Inteleon is guns, yes, but the others have very little convincing thematic linkage: Swampert doesn't have any specific abilites or learn any moves I can call to mind that play into its fan-blade motif, Feraligatr gets punching moves... but so does everything, so I'm not sure how brass knuckles specifically applies, Primarina has been alternatively linked to maces and bombs, and Quaquaval... I've yet to see a firm consensus on what weapon Quaquaval is supposed to be associated with. If you squint you can link the others, but they're both quite hit and miss.