Wow. I'm even more depressed after reading all of that. GHEZ. Complicated. I appreciate all the hard work that I imagined went into creating that. Thank you. Now on to your conclusion. You wrote:

SS then would have ruled out that you qualified via the GRID Rules even though you are over the age of 50. When going through the 5 Step Sequential Process, they determined you could no longer perform your prior work (step 4) but could perform other work (step 5).

So . . . I came close? Got tripped up on the last and final step?!