I believe the dual-nature (Christology) idea is mistaken and incoherent because the word 'nature' should imply all of one's attributes, not merely a sub-category of attributes (human vs divine). Jesus by definition had one nature. Whatever attributes he had, whether human or divine, are all part of his nature.
The reason people want to resort to the incoherence of "two natures" (two the-way-you-are's) is because they want to affirm Jesus' humanity and his deity. They want to affirm his deity in a way that would seemingly contradict his humanity. Adding a second 'nature' removes the contradiction from the foreground allowing the phrase "according to his [such and such nature]" to be inserted immediately prior to any contradictory statement. However a reasonable theory avoiding contradicting attributes can be easily understood without adding a second nature to Jesus.
When Jesus gave up his "former glory" (John 17:5) and "divine form" (Phil 2:6-8) in order to be "made flesh" (John 1:14) "like his brothers in every respect" (Heb 2:17) he did not become another person. His nature changed, but his identity was still the same - the divine Son (or logos) of God. His identity was not dependent upon a particular form or attributes (Mark 16:12, Luke 2:52) any more than a celebrity's identity depends upon their changing weight, hair color, skin color, etc.
Prior to the incarnation Jesus had a divine form and of course was God (not the Father) in his identity.
After the incarnation Jesus was now 100% human - no longer in divine form - yet remained God in identity. But could Jesus being divine actually change? That's the whole point of the incarnation.
The incarnation among other events was an actual locational change for Jesus:
- "I came down from heaven" (John 6:38)
- "What if ye shall see the Son of man ascend up where he was before?" (John 6:62)
- "I came forth from the Father, and am come into the world: again, I leave the world, and go to the Father." (John 16:28)
- "he was taken up; and a cloud received him out of their sight ... they looked steadfastly toward heaven as he went up" (Acts 1:9-10)
This begins to solve all the Christological (and Trinitarian) controversies that I've come across. It appears to me that doctrinally dividing Christ into two natures began much division in the body of Christ, the Church. My hope is that understanding the unity or completeness of Jesus would inspire unity and completeness in the various divisions of the Body of Christ.