Actually the secured creditors were free to challenge it. But like I said, if the agreement results in a larger net recovery then why would anyone challenge it? They could either hold onto the $2K and essentially lose the value in the equipment/property at the Wayzata space (which as likely quite a bit more than $2K) or give Wayzata their $2k and sell the property/equipment and get more in return.
Nothing illegal about that since the secured creditors interest is served by doing so.