And that the Apostle John was the writer. Arguments for a LATE date 1. No reference to destruction of Jerusalem in AD 70. Highly developed theology takes time 4. His seeming ignorance of Synoptics.
Apostles is a later term.
John's concern for elevation of the Baptist. This was not a problem later. Hard to see he knew them 2. Not developed yet, though maybe early Doceticism 3. True, one aspect 4.