Youpi solos the verse as far as I'm aware
superior speed by a large margin (can easily blitz a healthy Knuckle who already outspeeds KnY characters by a lot) and his Rage Blast is high end town level to small city level depending on which end of the current calc you take, nothing in DS is bouncing back from that
Demon Slayer really has no business with anyone outside of York New when their best feats are Muzan barely surviving an explosion that’s at best 100s of tons if the average mountain is tall enough in that area of Japan, Doma freezing that Ice Buddha the height of that room in Muzan’s palace, and Gyutaro flattening the Red Light district. The next best feat is fucking derailing a train with death throes and that doesn’t even remotely measure up to the previous trio in magnitude.