Dear brother Eric,
I was only explaining that oikonomia is not a changing of the divine law, and don’t draw any conclusions from it. But I will attempt to answer your question.
I can only explain it from the perspective of the Coptic Orthodox Tradition, not from the Eastern Orthodox Tradition.
First, in the Coptic Tradition, the spiritual adultery/apostasy is what breaks the bond. It is not the ecclesiastical divorce. From my understanding, the ecclesiastical divorce is an ecclesiastical confirmation of sorts that the bond has been broken, not that the ecclesiastical divorce is what breaks the bond.
Second, the marriage bond is considered to be broken either by spiritual adultery/apostasy or physical death. So the innocent party in a divorce or a widow/widower is not going to be guilty of having two spouses.
Third, the rite utilized for a second (or third) marriage (whether of a divorced person or a widow/widower), has a character to it that is absent from the first marriage - i.e., it is penitential. Also, there is no crowning ceremny. There are those who do not consider it a Sacrament.
I hope that helps.
Blessings,
Marduk