You raised a good point, Bobcat, re "the sons of this system are given in marriage etc..."
I forgot and always overlooked that statement. Another good point that was mentiond was that "it wasn't good for man to live alone, so he made a helper for him, a complement"
So in a human environment, Men and women, are an Entity that is natural and goes along with the perfect divine plan.
Jehovah, also stated a command for man and woman. He stated, " fill this earth and subdue it." So the gift of procreation, and it's desire to do so would reach it's limits in a perfect world. Then what would happen? Would women no longer be a helper to man? or, Would a woman no longer be a complement, or would that union of one flesh terminate? I don't think so. The whole purpose of having both genders is to balance one another. The human society needs balance, even in a perfect state.
Today, the marriage vows end with the statement, "till death do you part". So death annulls a marriage.
The GB is right is saying that they don't know the answer to this ressurrection question. If one is ressurrected to a Spirit creature, then there is one gender, and don't need this couple arrangement to balance human nature. If you are resurrected as a human then you would be incomplete. If that makes any sense, or, if I'm on to something, or maybe it's this rye that is confusing me.