Kingdom Hearts 4 references a bit of OG lore so obscure I wouldn't have blamed Tetsuya Nomura for forgetting it

Kingdom Hearts lore is extensive, convoluted, and confusing. I don't mean that as a dig – I am a Metal Gear fan, after all – but even after playing every game in the series, I've still got to read a half-dozen wiki pages and watch a few lore videos before I start remembering the specifics of any giv…