Very interesting theory, Dave. I was well aware of the sad end of Takamori and the circumstances, but I think it’s the first time I hear about Satsuma-age. That’s funny, because Usagiya is one of my favorite website, but I guess I must have missed that one. Thank you for this, Dave!
Actually, I’ve just reread Usagiya's page and had seen this before but if I knew the shortening process, I had never noticed it was linked to Satsuma. Very interesting.
EDIT: by the way, here’s an excellent book about Saigo Takamori
https://www.amazon.fr/gp/product/B00DRDS1L2/ref=ppx_yo_dt_b_d_asin_title_o02?ie=UTF8&psc=1