"Can" you do "some" kata with a sai??
Yes, but that is a long way from the idea that the kata WERE DESIGNED to be used as such.
I "can" pull stumps up with my car---that does not mean my car was designed as a "stump pulling device."
Part of the problem IMO with the assertions, is that are made with little practical training (as far as I know) in the systems in which claims are being made of what a given kata is "for."
In previous discussion on this topic, exactly how much training in goju or uechi the author has had, with whom and for how long have not been forthcoming.
Another problem with the logic is that it utterly ignores a pretty widespread and well known body of Okinawan kobudo.
Why bother to make a kata do double duty--when there is guy across the street that is already teaching a living weapons tradition in context with other weapons???
Why not just train there?
Which is exactly what many okinawans DID.
No matter what answer a person can come up with here---a valid explanation for why it was seemingly ignored is strikeingly missing from the posit.
Like I said "can" it be done that way?-Sure.
"Can" you develop some skills like that?--Why not.
Was the kata designed to fuction like that?--Probably not.
Are there "better" ways to train such skills and still keep to the classcial okinawan methods?---Absolutely.