Sources on debates over early Christology

Christian Alexander

What are some good sources on debates over early Christology in the Gospel of John? 

David Thomas

The premier active Evangelical scholar I think of with John's Gospel is Andreas Kostenbegrer

This would be a good starting point - https://www.logos.com/product/26690/a-theology-of-johns-gospel-and-letters-the-word-the-christ-the-son-of-god or check out his podcast at 

https://podcast.cbs.mbts.edu/feed.xml where he is walking through lectures on John's gospel.

Olli-Pekka Ylisuutari

Andrew T. Lincoln has a long paragraph on this topic in his Black’s Commentary.

https://ref.ly/logosres/black64jn?ref=Page.p+59&off=28

Phil Gons (Logos)

A search for heading:Christology WITHIN 5 WORDS (heading:John OR heading:Johannine) seems to produce some good content in my library.