I am wondering if a game of "chicken" is in progress re. the leases.
Both GGP and the claimant/litigant know that time is running out. If it does then most leases are worth nothing. Neither party will want this.
This will sharpen both minds, and possibly make a compromise more likely. (Assuming that the litigant has a valid claim).
This might unlock a JV. Lets hope so.
Just MHO.