The so-called Outer Body Incarnation doesn't actually mean Chu Huaixu truly gets a double.
It doesn't have a self-awareness.
This technique isn't high-grade enough to, say, pull off something like "One Qi Transmuted into the Three Pristine Ones," where your will and consciousness can fully inhabit a new body, making the double as nimble as a real person, able to walk the world like an ordinary man.
This kind of incarnation can only accommodate a small sliver of consciousness, and can only carry out some relatively simple actions.
Otherwise, there's no way this technique could be learned for just over a million Experience Points.
"Strictly speaking, it's basically like getting an extra War Demon."
"The difference from a puppet is, this so-called double can actually practice basic cultivation—it can cultivate."
"Under normal circumstances, the prior cultivation of this puppet body can be directly inherited as well."
