Good job describing Jesus’s real humanity. I wonder if he will enter the debate of Jesus’s assuming a fallen nature.
He has an excursus on the Nestorian debate. I will point out that Letham, contra to popular attacks on Reformed thought, understands Nestorius’s teaching that the prosopon was formed as a result or conjunction of the two natures (24). No Nestorian claimed that there were two Persons of Jesus.
He does acknowledge some of the rhetorical and conceptual shortcomings of Chalcedon. It “left the concept of the hypostatic union unclear” (28).
Drawing heavily upon Meyendorff, Letham has a lucid account of enhypostasis. “Because Christ’s humanity has divine life hypostatically, we can–in union with Christ–receive divine life by grace and participation” (32). This buries the contention that the Reformed reduce all of salvation to justification and forensicism.