Time is relative.
(May 2022) Personally, I really like the theory of gojou losing 6 eyes (in a narrative sense).
Possible foreshadowing hasn't been incredibly subtle either. These are from the 2 openings and the Phantom Parade video (Avant by Eve, which is technically not canon but still a recurring theme). Vivid Vice especially had a bunch of foreshadowing for the Shibuya arc, so I wouldn't be surprised if this was slipped in there too.
Based on the fact that Nanami was gonna be a villain who killed his entire office heh.
Canon Nanami hates working overtime but will still do it, villain Nanami would rather kill his entire office than work overtime.
He then escaped to Malaysia and lives happily ever after.
+ canon nanami doodles
Prosthetic arm Inumaki I drew while waiting for him to be back in the manga lol