Assuming I'm following all that correctly, you have a man in two concurrent marriage contracts. That's bigamy (which would probably be considered a misnomer if all of this came about).
I should probably point out that I consider one of the non-arbitrary aspects of a marriage contract is exclusivity. Whether talking about a monogamous, polygamous, or open marriage, one of the defining aspects of marriage is that you are only in one marriage at a time.
Now, as I'm thinking about it here, I suppose that you could define a "marriage" contract that does not require exclusivity, but at that point I think I fail to see how it could be considered a "marriage".
There are many definitions of what "marriage" means, but all the ones I found tend to talk in terms of "union" and "melding parts into a single whole". Even when we use the term "married to an idea", we are saying that we cannot be parted from it. If we hold to this most generic form of the term, one person could not be united into two separate single wholes.
If someone is a bigamist, they are not truly entering into a marriage, a single union, for the simple reason that the people in the various marriages are not in union with each other. Even if they are okay with the situation, they are still separate entities that simply share a common member and would not constitute a marriage. (This would make for a great Venn Diagram.)