I like the idea, I don't know if this has been said, but the only problem is that the Twilight Gap was held. It wasn't lost. That and the only group that assaulted the Last City at the Twilight Gap was the House of Devils. So I guess there's three problems. There was no evacuation. The Last City was the one under assault, the Gap was the focus of the assault. Again, good idea, just needs to adhere to the Canon Grimore.