I have given up entirely and decided that the potential in Pazmat is just done with an adjective meaning "able", the weird pseudo-relativising particle *na* and then a deranked participle clause. Negative potential statements just use a completely different adjective meaning "unable". Also the adjectives are defective (athematic only), must appear in the locative

"I can walk to the store
...I should define what the hell *na* does because as of now it's a really weird particular that sort of acts like *that* in English when used to relativise, but doesn't *necessitate* a deranked clause. In addition, many times it's not used where *that* would be: