I'm familiar with Dr. Segal's work. To put it charitably, it's thin.You could look into Alan Segal, a rabbinical scholar who wrote the book "Two Powers in Heaven" and Dr. Michael Heisner, a Chrisitan scholar who also writes about how OT writings support that Jesus is and has been the king of the Jews. They go into the idea much more thoroughly.
http://twopowersinheaven.com/
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