I don‘t think you know what the letter means or you wouldn‘t guess around like that or post bold claims.
They can go up to Z (and then probably go double letter? who knows) if they require to (the letter afaik refers to the Kernel version, not the point release number).
Side note: the highest they went was L.
That's exactly what I wrote! Apple can go as far as they want but since iOS 9 they haven't gone past G. That's literally all I said. I never made any bold claims or proclaim that I knew the whole truth.
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Either iOS 3 or 4 had one that high.
I believe you but... where's the source for that one?