Super: But as we can see, GJ was about a tie to GLFW in martial arts and internal energy. But it was also stated that GLFW has 20 years more time to cultivate, while GJ was luckier(probably 9 Yin).GJ trained for about 16-17 years of 9 Yin from LOCH to the battle at Mongolian camp. Therefore, although it's only assuming, GJ progess over twice the speed of GLFW's internal art with 9 Yin.
--- If you really want to know if GJ's 9Yin is as good as advertised:
1. compare age of GJ's innerPower at end of LOCH, and then compare YG's innerPower after battle with GWM at QZ Palace. If equal, then then there is a possibility that 9Yin=IronSword training.
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2. compare GJ's innerPower (10year 9Yin training at PeachBlossom Island) to YG's woodenSword training innerPower (7years of training). If equal, then there is a possibility that woodenSword training is better than 9Yin.
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3. Got better theory, later k?
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c38: VF requires a much lesser exertion of power and can still maintain its effectiveness. If YG is just throwing out sad palms and GJ is dodging and defending using soft neutralizing techniques, YG's bound to use up his inner power and allow GJ to retaliate.
--- Is there any proof VacantFist uses "lesser exertion"? However, I recall (distantly) a fight in GuLong novel about the "softest" technique vs. "hardest" technique and both did a neverending(?) battle ("tie"?). It's like the battle betw LuXiaoFung vs. ScarletBandit but more lofty? I think TigerWong/Meh/Athena/Moin can help here.