What are some good sources on debates over early Christology in the Gospel of John?
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.
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
A search for heading:Christology WITHIN 5 WORDS (heading:John OR heading:Johannine) seems to produce some good content in my library.
