"The flat stones ... may be precursors to later ninja weapons" To call that tenuous would be act of extreme generosity.

I like it: a cool alternative to the traditional "may have been used for religious or sacramental purposes". Try substituting it in other archaeological write-ups: "the first-dynasty sarcophagus was found alongside a variety of ninja weapon prototypes..."

Well, but why stop there?

> were known to throw makibishi — usually made of metal — while fleeing an enemy on horseback. Horses would step on the spikes, slowing them down and allowing the ninjas to escape.

"the first-dynasty sarcophagus was found alongside a variety of Mario Kart weapon precursors..."