Base Kashimo vs Meguna should've been 1 full chapter (Meguna uses the remaining Shikigami that weren't fused into Agito for whatever reason, Kashimo brings Meguna's health bar to 0 and forces out his transformation)
And then at least 1 full chapter of MBA Kashimo vs Heian Sukuna. Imo Kashimo should've had a Maximum (something like Kirin from Naruto), and Sukuna should've countered with his own Maximum to overpower and beat Kashimo.
This way, we actually get to see what Shrine's Maximum is (I guess Fuga sorta functions like its Maximum, but it was never referred to as such, and idk why Gege just ditched Maximums). Gege could add a rule that Sukuna has a long cooldown on his Maximum, which would give a logical reason why it was never used, and this way we could say that Kashimo actually accomplished something in the raid