In HSDS, it seemed that Nine Yang was the greatest Shaolin internal skill because the temple head and elders seemed to be proficient in their own version of Nine Yang. Whereas in DGSD, YJJ seemed to the the top Shaolin internal skill.
1. Given all the information shared in the two novels, which is the best internal skill?
2. Any idea who created Nine Yang? I'm assuming it's XZ from DGSD because he inherited the carefree sect's skill