At the end of HSDS, Miss Yang, heir of 9 Yin, came to Shaolin to help ZWJ against ZZR's attack. She obviously had the complete version of 9 Yin and had trained it for years. How does her kungfu compare with ZWJ's?
9 Yin vs. 9 Yang: this should be an even matchup, but ZWJ didn't have 9 Yang for as long as Ms. Yang had 9 Yin. He also didn't have a master to guide him in 9 Yang training as Ms. Yang almost certainly had for her 9 Yin. The only advantage ZWJ had would be QKDNY.
So how do they match up against each other if they would match up?