Second, 'kephale' is a cognate term to the Latin 'caput', and the terms 'captain' and 'capital' are both derived from it. I believe also that somewhere 'kephale' is refered to as a person who advances at the front of the troops in war, or as the unit of infantry that advances at the front of the larger unit. I do not have a reference for this at the moment and so will come back to that another day.
Basically, 'kephale' meant sum, summary, or capital amount of money. Now let's look at Ephesians 1. I will try it out, replacing kephale with captain and then with capital and see how it works.
"Praise be to the God and Father of our Lord Jesus Christ, who has blessed us in the heavenly realms with every spiritual blessing in Christ. 4For he chose us in him before the creation of the world to be holy and blameless in his sight. In love 5he[c] predestined us to be adopted as his sons through Jesus Christ, in accordance with his pleasure and will— 6to the praise of his glorious grace, which he has freely given us in the One he loves. 7In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God's grace 8that he lavished on us with all wisdom and understanding. 9And he[d] made known to us the mystery of his will according to his good pleasure, which he purposed in Christ, 10to be put into effect when the times will have reached their fulfillment—to bring all things in heaven and on earth together under one head (captain/capital amount), even Christ.
11In him we were also chosen,[e] having been predestined according to the plan of him who works out everything in conformity with the purpose of his will, 12in order that we, who were the first to hope in Christ, might be for the praise of his glory. 13And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit, 14who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession—to the praise of his glory.
Thanksgiving and Prayer15For this reason, ever since I heard about your faith in the Lord Jesus and your love for all the saints, 16I have not stopped giving thanks for you, remembering you in my prayers. 17I keep asking that the God of our Lord Jesus Christ, the glorious Father, may give you the Spirit[f] of wisdom and revelation, so that you may know him better. 18I pray also that the eyes of your heart may be enlightened in order that you may know the hope to which he has called you, the riches of his glorious inheritance in the saints, 19and his incomparably great power for us who believe. That power is like the working of his mighty strength, 20which he exerted in Christ when he raised him from the dead and seated him at his right hand in the heavenly realms, 21far above all rule and authority, power and dominion, and every title that can be given, not only in the present age but also in the one to come. 22And God placed all things under his feet and appointed him to be head (captain/capital) over everything for the church, 23which is his body, the fullness (rest of the troops/entire sum) of him who fills everything in every way."
Some men think first of the military metaphor and others the banking metaphor. Some will say that Christ is asking us to join the army. Others may see that Christ is like money in the bank for us and the church is the entire sum, principal and interest. A quick glance at verse 14 and other passages marked in purple shows us that the banking metaphor is not completely unlikely. Even references to adoption and redemption are associated with money.
What was the most obvious reading in Greek? Not necessarly ruler. Highly unlikely that it was ruler. Some day I will research the other suggestion - that 'kephale' was the sharp point that led the troops to war. That does not imply the brains behind the strategy, but the one who takes the most risk. Others say that 'kephale' means the source, the origin, the nourishment, as the head of a river.
Probably men should be the first to confront an intruder in the home, as Gerald said, maybe they should be the main providers; but in this economy, they should not feel constrained to support a woman staying home as the children grow up. That should be worked out completely and entirely according to the mutual agreement of the couple involved.
I have never seen a reference to 'kephale' being the decision-maker, the ruler or governor in Greek. Not that the Greeks weren't completely preoccupied with this idea - they were, but they found other words to express it.