Mioru isn't weak physically. The problem with her is in her mind. She's over confident and she's easily run by her emotions. Or maybe Kayden is just really good with his mind games that he manages to get on Mioru. But seriously tho, there's nothing wrong about being confident. Kayden is confident with his self as well. But with Kayden, even tho he is confident with his power, he never looked down on his opponent. He never really have the "I'm so powerful so I will surely win." mindset. That allows him to think more.
Mioru isn't weak physically. The problem with her is in her mind. She's over confident and she's easily run by her emotions. Or maybe Kayden is just really good with his mind games that he manages to get on Mioru. But seriously tho, there's nothing wrong about being confident. Kayden is confident with his self as well. But with Kayden, even tho he is confident with his power, he never looked down on his opponent. He never really have the "I'm so powerful so I will surely win." mindset. That allows him to think more.