Craig

Thanks Kristen and Gengwall for your helpful comments.
Just wanting to toss out some more ideas for your comments. I hope they are not too confusing so you can follow what I am thinking. Some of them are just new thoughts for me and I haven’t thought a lot about how it fits with all the relevant passages. They may be totally different to what you others think, or you may agree.
If 1 Cor 12 is just a body metaphor and not a head-body metaphor, I am wondering about whether Paul may not be using a head-body metaphor in Eph/Col either, but rather adding the concept of a head (source) to the existing body (including the head) metaphor.
With what I am thinking about, the church is the body (including the head) of Christ and Christ is the head (origin, source of supply,) of the church, which is his body (including the head).
The union of Christ and the church is not the union of a head with the rest of the body from the neck down, but rather it is the union of Christ (including his head) with all of the church so that we are all Christ’s body (including his head). We are thus “in Christ” and one with Him.
The union of a husband and a wife is the same. It is not the union of the husband-head (just from above the neck)with the wife-body (from the neck down) but a total union of their total bodies (including their heads) to become one flesh.
The husband can thus speak of his wife as his body (including his head), and one with him, just as the church is Christ’s body and one with Him.
These concepts would indeed qualify as a profound mystery Eph 5:31,32.
The husband would then be the head (origin, source of supply) of his wife, who is one flesh with him, which is easy to see in Adam and Eve (but not so easy to see for all other marriages- so I am still thinking more about that one).