Anyone care to provide any reasoning?
Surik's mastered all forms of lightsaber combat. Kenobi has mastered two. While I'm happy to admit his Soresu is far more prominent than hers, it doesn't matter. Frankly he lacks the offensive ability to break her defenses, since even Atris (A master of Juyo) could not. She on the other hand can break his, and she has outrageous stamina if she needs to take him down.
We've seen multiple times in his duels with Maul that physical attacks are one of his weaknesses. Someone who can take out powerful dark jedi with her bare hands isn't a mook when it comes to physical blows. She's also mastered the Echani styles and can use precognition against him.
She also has intricate knowledge on his forms where he has little on hers, and can even learn from him as he fights.
In terms of force power, she simply outclasses him. The guy who's ragdolled by Dooku, vs the woman who faced down Traya in the galaxies greatest dark side nexus and won.
She's his better in every single way, deal with it.