mm43 - what is the meaning of 'AoI' in your diargam? If it is 'incidence' I think we need to be careful on definitions, but I cannot see that it has much relevance anyway.
To follow Franzl, some while ago in discussions somewhere in this maze about 'recovery' I said that the pitch change required to unstall could have been as high as 50 degrees nose down - well past the limits most pilots would contemplate. This would indeed have drastically increased the rate of descent until sufficient manoeuvre capability was there for pitching nose up, which is why my subjective assessment of min recovery altitude from THIS stall was around 20k.
I don't really want to be dragged in to the SS/yoke battle except to say that if I had been dragged out of my pit in my silk pyjamas and arrived in a cockpit at 35,000' with 15 degrees nose up, 10,000fpm+ and a co-pilot with the yoke back in his groin, I might have had a clue as to why the nose was up that high - I hope so.