Why is the Gospel of John different then the other three Gospels? Have you ever wondered about this?
I can think of one reason why the book of John is different than the others. John is someone special...

Now there was leaning on Jesus' bosom one of his disciples, whom Jesus loved.

When Jesus therefore saw his mother, and the disciple standing by, whom he loved, he saith unto his mother, Woman, behold thy son!

Then she runneth, and cometh to Simon Peter, and to the other disciple, whom Jesus loved, and saith unto them, They have taken away the Lord out of the sepulchre, and we know not where they have laid him.

Who is that disciple?

This is the disciple which testifieth of these things, and wrote these things: and we know that his testimony is true.

It's John. Among all the apostles, only John received that special attention. No wonder he would have a different view on things. No wonder he was able to write the book of Revelation.
As James and John grew older didn't they recieve some teachings from the Essenes ? who were on the Northern Banks of the Dead sea

I know they grew up on the East side of the upper Jordan River in a little village named BETHSAIDA

John was the youngest of the 12 disciples

John responded to the spirit of Love that Jesus Expressed
Jesus recognized this and continued to teach John

polycarp a disciple of John leave little doubt that John the apostle the son of Zebedee wrote the Fourth Gospel

when John wrote the accounts of Jesus works he understood the spiritual principles behind them .
most of his messages revolved around the last week of Jesus ministry to the Jews .

John was active in Ephesus
and surrounding towns