This lawsuit is more to protect TNA's future. WWE now has all the contractual information on every TNA wrestler who signed a deal in 2011 and prior. That means when ever they want they can contact any wrestler 2-3 months before their contract is up and undercut TNA. TNA is trying to put a stop to that.
This is what you have been told is the issue. This is not the issue. This is a smokescreen.
For the longest time (somewhere around 'ever'), when someone is under contract to one party but wishes to explore his options with another, he'll do something called "putting out feelers". It means having people who aren't you inquire casually about the possibility of a deal. You can discover if the other party has a desire for your services, without the risk of talking to them yourself and alienating your current employer.
Seeing as this practice has been going on since we started growing crops in rows, when TNA/IW says they're trying to protect the information on contract status, they're bluffing. To a small extent, this
is true, but the usefulness of this information is limited. Considering you'll know if a guy is coming out of contract soon because he'll be sending cohorts your way if he is, the only useful information you get is who's under contract for a very long time; and most of that information is publicly available anyways with a quick google search.
Here's what the issues REALLY are:
1) The WWE knows how much TNA/IW is paying their performers. This is the biggie, because the WWE can offer people they'd like a contract- at the appropriate time- which improves on their TNA/IW offer, while lowballing what they might have received otherwise. This is the Big One, and what makes this case legally worth pursuing. The WWE has an insane amount of leverage because of this; leverage that they shouldn't.
2) TNA/IW wants to stop this sort of issue in the future. The most powerful way to change someone's behavior is to bring them to court.
I'm nowhere near familiar enough with the case to comment on the likelihood of a winner. Strange shit happens in deliberation rooms, anyways, and the decisions frequently sound insane to anyone who wasn't in the jury. But the issue that is being sold here is not the issue that's occurring.