[Campion]

Also a shame that when John wrote Revelation, the temple was already destroyed.

Your proof for that is what, exactly? I don't think you can get it from the text.

[Roman_War_Criminal]

Tacitus and Josephus wrote extensively on early Christianity with dates/reigns.
Romans tried to kill John by boiling him alive among other things. Once they figured out it was divine will keeping him alive, he was exiled.