Re: final lock doesn't work
I thought the same thing not so long ago... for instance, on the Shihonage pin it seems very easy to slip out and get back to a neutral position. I asked my sensei, and gave him permission to show me where I was mistaken.
See, it is true that the uke cooperates, but the nage goes out of his or her way to be extra gentle. My sensei, without applying much pressure at all, nearly wrenched my shoulder out.
I was convinced.