GodHard work works in mysterious ways. I know I worked very hard on that epiphany. I didn't think it would come easy to any one. And now it looks like my appraisal may have been correct all along. Well I must wait for Shen's response first. I am terribly sleepless (36 hours awake). Curiosity killed the cat.
Btw, if I am correct, I don't expect he can fix it. The issue is fundamental. You either have the epiphany I had or your don't. You aren't a little bit pregnant. Based on my design, I can conclude he isn't any closer than he was when he started.
Edit: in addition to and separate issue from the above, Shen has admitted a slight loss of generality in his design (which I claim my design does not lose) and which apparently can't possibly be fixed because mixing inputs with outputs in the signature is inherent in his design: