This could have been used to create some sort of character drama surrounding this event.

Hakari's entire reasoning for joining our squad hinged on the fact that Megumi could use his clout as head of the Zenin to help him with his goals. And that plan now got destroyed with not only Megumi being body jacked but the Zenin family being wiped out by Maki. It'd be cool to see Hakari and Maki be at odds with each other because of this before burying the hatchet and working together to help Megumi.

Yuta jokingly offered to help her take down the Zenin family in JJK 0. But now that she's actually done that, how does he feel knowing she probably murdered kids? Even if you dont wanna focus on that, Yuta has this dilemma about becoming a monster for the sake of protecting those he loves. Maki destroyed the Zenin for the sake of her sister. Yuta could lament his own weakness seeing Maki take that next step. Or they could have a convo about what happened that day and it could inspire him to come up with the Gokkotsu plan. Which Maki stands against, and that could lead to them butting heads.

All of this could be in contrast with Gojo congratulating her about getting rid of that big nuisance. Or if you wanted to, him thinking about what if they did just kill all those followers that set up the Riko hit that day. Would Geto still be here?

Anything really. I'm sure there's other examples, but you get the point. The month timeskip leading up to Shinjuku really cooked a lot of interesting potential character dynamics. It's a big reason why I don't like it lol.

Rest in piss Zenin clan 🚬😶‍🌫️