After reading all of this I feel for you OP. I'm going through a similiar situation with a repair facility, but not to this extreme. I'm tight lipped on the situation until it plays out since lawyers are involved.
So the dealership has a 10K difference to make up between probably the insurance estimate to a new ZL1 correct? Why in the world would they drag this out for 10K? I bet they lose way more then 10k especially when ur dealership is on TV for negative publicity through the whole Northeast. Makes me wonder sometimes. Goodluck to the OP I stand behind you and hopefully this knucklehead who wrecked your ride gets prosecuted somehow someway.