It's not like I win every single damn time I fight with Koty, and blaming it on the character is rather shallow. I have heavy involvement with why Koty wins, it's because I think my shit through. If I got into a fight with someone good they'd stand a chance, and the only ones who have really slowed me down every would be you, Nisorin, or K2.
And no, technically he loosened the seal, as he doesn't have the power to unseal it entirely. Even loosening would provide a major boost in power, as he is of course a powerful entity.