Can someone help me understand why Zhang Wuji wasn't able to master the seventh level of Qian Kun Da Nuo Yi the first time around when he zips through the first six levels due to his strong base of Jiuyang Zhen Jing. What exactly was the roadblock in achieving that seventh level?
Also does Zhang Wuji eventually master all seven levels? Does Zhang Wuji also master all the Martial arts of the Holy Flame Tablets? Is Qian Kun Da Nuo Yi similar to the Martial arts of the Holy Flame Tablets?