Jewish texts of the period give final judgment to human or angelic agents: the Son of Man in 1 Enoch, Abel in the Testament of Abraham, Melchizedek at Qumran. Wasn’t judgment a delegable role?

This is a real finding from Second Temple literature, and judgment was not unambiguously God-only in every Jewish text. Two replies. In those texts the agent judges by explicit delegation and remains clearly beneath God; in John 5 the stated purpose of the Son’s judging is that all may honor the Son just as they honor the Father, which no Jewish text says of Enoch or Abel. And the argument is cumulative: judgment plus life in himself plus creation plus receiving worship. Any one role can be delegated; the whole cluster is what marks the divine identity.