Yes, both Monsters and Depths opened when they let SnS go, and Corpses usually followed at about 6. My usual attack was Monsters, Depths if I felt like it, and by then Corpses was open and a walk on. I'd then go straight to Hellbilly, stick around till I'd seen both Living Dead Girl casts once, then walk through Zombieland, Vanity Ball, Klowns if the wait was reasonable, and out of the park before 8.