Ling HuChong was able to defeat his teacher, YBQ using DG9J (claimed to be the ultimate sword arts in a whole JY universe, if you don't consider 6MSJ a sword art) and it's also because YBQ after executing the complete sets YBQ repeats the previous moves, so that LHC was able to explore the flaws.
But how powerful is PXJF actually ?
Could other fighters other than LHC defeat YBQ with different sword arts other than DG9J? Say... the WuDang Priest with his Taichi sword techniques ? What about other fighters from other novels with different powerful sword arts ?