He didn’t know that Ye Feng was different from other people since he used Zhenqi to practice. Besides, he also didn’t know that Zhenqi and inner qi were totally two different things.
The reason why the inner qi is referred as “inner qi” because it’s extremely difficult to pull it out, and it can only be attached to the body or a weapon to enhance its power.
But the fact was that Zhen qi was more suitable with the natural world.