But there was an amendment, but yes it wasn't signed by Ampenergo, and yes it appears that Darden attempted to influence Ampernergo. And yes, it is all a big mess.
Not too much of a mess. An unsigned agreement by itself is not enforceable. Now you may have verbal agreements, but ....
I have several unsigned agreements from people in my files, but I did not agree with the "agreement" You just need to renegotiate.