Re: Origin Go Shin No kata weapons
I was in Swintzerland when Nariyama-shihan taught the kumi-tachi -- the 8 bokken vs bokken techniques of the Goshin. He said that we were to do them exactly as shown and not interpret them at all since they were techniques that were passed as is from Takenda-sensei to Ueshiba-sensei. So, at least that part is very old indeed -- at least 100 years or more.
I am not sure about the rest but I have seen similar techniques in Aikikai. Then again, there's no shocker there.