Customers wait for the 11am opening of Killen’s BBQ in Pearland on Saturday morning. (Photo ©Chris Wilkins/Texas BBQ Posse) Even before we had finished eating at Killen’s Barbecue in Pearland on Saturday, the great debate began. “When you factor everything in, this is the best barbecue place in Texas,” declared Posse co-founder Chris Wilkins. We ate brisket, pork ribs, pork belly, beef ribs, turkey and sausage. Everything was excellent — moist, flavorful and nicely cooked. On a scouting mission in May, Posse member Jim Rossman called the food at Killen’s, which opened in a permanent location early this year, “spectacular.”…