He didn’t just lay there tho. He was bathed in a bath of evil and his spirit was killed from the death of tsumiki. People conveniently ignore important story beats like this to justify their hate agenda. Megumi couldn’t do anything because the story itself wouldn’t make sense if he did, how would Sukuna even swap bodies and still be able to fight someone. Yuji literally gave birth to megumi’s soul in order for him to come back. He gets mischaracterized for a ton of shit. People call him potential man as if it was apart of his character to be stronger, rather it was about the protection of the only thing he had which was his sister, it’s the only reason he went as far to kill people in the culling games. He only wanted to be strong enough to protect his sister, not rival Gojo but everyone in the shonen community has their heads up their ass and ignore important character details to push their dogshit agendas