Adapting instantly to someone's style is something even first key Mori can do, with him being able to get one-shot by a move once, instantly counter it, get one-shot by an even more improved version of the move, and then counter it AGAIN and even create an entirely original much more powerful technique based off of the skill that was previously thrashing him.
People like Seungcheol Baek can walk up to a fight scene days after it happened and just from looking at a guy's footprints can visualize the entirety of the fight scene in his head down to the last move, and can even decipher the intentions of the fighters despite having literally nothing to go on but simply some footprints, and he incorporates this level of analytical ability into his fighting style to form a style that combines both "power and knowledge", and he's no match for Mori.