In short, the sayings material in John comes from the post Easter church. I am not saying it’s wrong but I think it developed out of Jesus’s own self-views based upon experiences of the post-Easter community.
John reframed synoptic traditions in my mind and he scoffs at the notion of Jesus asking the cup be taken from him.
Not to mention, a lot of the “divinity” sayings of Jesus are only obviously divinity sayings after almost 2000 years of Christian interpretation. Jesus could have had a high view of himself without thinking he was fully God. Though John 1:1 makes his own views on this issue quite obvious.