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Looking at the build-up from only the perspective of the sorcerers alone will make someone believe that Shibuya was something that was spontaneous and didn't feel built up which if you look at it from that perspective yes that is how it would seem.

It honestly forces me to believe that something is up with Hana. Maybe a relationship with Sukuna causing discourse where a fight is inevitable making the chances of her helping us very slim? But If there is a fight, it's possible that Yuta's copy ability can work on Hana-- 

In many anime and manga, there is the trope of the businessman that is utilized to express a sense of seriousness in particular situations or used to introduce a tone of solemnity upon a story's characters or story arc. Nanami Kento is this character in Jujutsu Kaisen.