Again, there is NO passages that one can use to support that notion, its more that he is assuming that since we are all now one in Christ, and all are gifted, that God no longer has a male leadership/headship going on still, but that is rooted right into creation irself!The chapter "Paul and the Eschatological Woman" addresses the topic at hand. All of the book is worth reading.
I doubt you will be able to preview all of the pertinent material, but you should be able to see enough of it to understand that Dr. Ellis is dealing quite conservatively with the text - not like some commentators who have not bothered to review his work have asserted.