I've been told that Kanazawa Sensei learned this kata as a child. I do not remember where he learned it from. When he visits again I will definately make a point of asking him. You have peaked my curiousity. please ask Kanazawa Sensei who he learn that kata from, i'm curious too....
By the way, i think the mentioned kata was not shotokan original kata (ie. there was no Nipaipo kata in shotokan ryu)....i guess this is Kanazawa sensei create it for SKIF only...... if my thinking is wrong, please correct me, thanks!