Kay

Mark wrote: “I would like to be pointed to an actual egalitarian paper which is not about debating anothers paper, and which shows there evidence for why they understand ‘kephale’ to mean source always in the New Testament. I would like to see evidence which actually shows that when a person is called the ‘head’ it means non authoratative source.”

“Jesus called them together and said, “You know that the rulers of the Gentiles lord it over them, and their high officials exercise authority over them. Not so with you. Instead, whoever wants to become great among you must be your servant, and whoever wants to be first must be your slave— just as the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many.”
Matthew 20:25-27

“Not so with you”

I find Jesus to be the Ultimate evidence.