It seems to me that the key to your question, Austin, is keeping clearly in mind the distinction between the person of Christ and the human nature of Christ. The person Jesus Christ is the second person of the Trinity and therefore divine. Medieval theologians were therefore careful to refer to the incarnate Christ as a divine person, not as a human person. To suggest that there is a human person Jesus Christ is to divide the person of Christ and to fall into the error of Nestorianism, thinking that there are two persons, one human and one divine. No, Christ is one person, and that person is divine. As such, he has all the attributes of deity, including necessary existence.
But that one person has, in virtue of the incarnation, two natures, one human and one divine. Orthodoxy requires us to affirm that Christ had a complete human nature composed of soul and body. Christ’s individual human nature is that body/soul composite which lived in first century Israel, died by crucifixion, and rose again from the dead. That composite entity is not divine, but human and therefore contingent. That human nature at one time did not yet exist, and there are possible worlds in which it never exists.
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