Kay

Mark wrote: “Secondly, as far as i know, that means for 450years the church understood kephale to not mean ’source’-this is significant.”

The church has misunderstand many things for hundreds of years before. Church history is littered with examples, both before and after the Reformation.
I think that about 700 years worth of Inquisitorial trials was more than sufficient. What about the Geneva Council with John Calvin burning “heretics” at the stake? How would we like that out on the church lawn after Sunday services this week? For hundreds of years the followers of the church of England and other Protestants regarded slavery as an old established and necessary institution which supplied Europe with the necessary workforce.