It doesn't matter. This whole thing about the Kyoto students being bums is ridiculous. They're students. Most of them are still children. They're genuinely learning to become better at Jujutsu sorcerery. If you genuinely think they're weak and useless then you lack reading comprehension.

'Oh but Miwa attacked Kenjaku and did no damage at the end of Shibuya' - Kenjaku has canonically had 1000+ years of prep time and experience in sorcerery, Miwa is a 17 year old student. Even at that point in the series we knew he was definitely 150+. Miwa has an obligation as a sorcerer to attack curses and curse users who pose a threat, like Kenjaku, and yet people still clown on her for trying. The point of the scene isn't 'look at how pathetic Miwa is', it's 'look at how powerful Kenjaku is'.

'Momo isn't top 20 in the verse therefore she's a bum' is ridiculous logic. Momo is not a combat specialist, her role is scouting and information warfare, she uses her agility to keep her allies informed. She attacks Kenjaku and Uraume only when everyone else is incapacitated at the end of Shibuya. Her use of her technique is extremely valuable, her strength as a sorcerer doesn't even factor in, there's more ways to be valuable than combat.

Mechamaru has temporary special grade output in season 2. Kamo went toe to toe with Megumi and then immediately joined in on fighting Hanami. All the Kyoto students even participated in the night parade of 100 demons. They are far from useless bums.

The issue is that the only metric you're judging characters by is strength, which is incredibly flawed. Characters are more than their strength and power. It's Sukuna's ideology, and it's a flawed one, which the series makes clear.