The angels were judged, that is communion was attempted. Those failing became the devils, and the good angels attained salvation which is inclusion into the body of Christ. The human Jesus was not then in existence, therefore the Trinitarian Son of God would have provided the necessary communion into himself.
The proof that the angels attained inclusion into the body of Christ, and now share in the divine nature is that Devils exist. These are simply those angels who could not attain communion with Christ. This inclusion was not made via human Jesus, who did not then exist.