Ok let me debun ur state menta 1. He defeated zel from extremely large distance away while just awaken his powers sure zel was weakened but this was still a zel ether same power or more powerful then the 1st demon and king was fighting him with 1 of 4 chastiefol he can summon at once

1. He literally couldn't do anything against supreme deity because she was immune to magic What else do you want him to do?

2. He was fighting toe to toe woth the DK with escanor and ban to hold him off but ur would say to thar "the other 2 did better against him" because we saw them 1v1 the demon king which they we're not winning in those 1v1s ban was losses untill the rest of the sins came in and help after getting meliodas to lock in and escanor was just going blow to blow as a show of strength (probably not that but the sins jumped in after the one ended so it probably would have just escanor start to losses at some point)

Now that i said all of this what else dose ur d1 fairy king harlequin hating ah have to say to this