Wukong, having obtained the flesh body of a Tongbei Monkey, used the Fetal Transformation and Easy Shape-Shifting technique along with a Primordial Spirit to cultivate a second body. This sort of body can't be called an "External Incarnation" anymore. No matter how marvelous an incarnation is, it will always just be an incarnation. However, this body is like a third cadaver chopped out, like an avatar, capable of being controlled like one's own arm, without the shortcomings of an incarnation—utterly mystical.
Wukong named this second body "Daoist Equal to Heaven," which also matched his moniker "Great Sage Equalling Heaven." He had his own plans, and in time, this flesh body would be of great use.