It's not perfect, and there is a GREAT amount of MC power that made this fight happen, but the execution felt great.
It wouldn't nearly be as impactful if we hadn't seen Rokudou's only talent be taking large amounts of punishment and the fact his opponent having the crap beat out of him by both Ling and our monster of a main girl.
It's just little things, but the way it is executed makes the suspension of disbelief JUST work. For me at least.