Well this bit was a lawyerly discussion - "who was it guilty of the Exposure Triangle, m'lud?". I read you as trying to put Langford in the frame. My point of view is that so far as I can see the Triangle is a neologism.
And my feeling is that it hasn't - and I've taken the trouble to try and see whether my feeling is correct or not.
ISO is fundamentally a guide to setting exposure. An adjustable ISO is so you can manually set which exposure you want to be guided to set. Makes sense? Of course it doesn't. It's the result of camera manufacturers basing their designs around a film emulation, because they thought it would be easier for photographers to understand. Really, there is no fundamental reason for having an ISO control at all.