you suppose that the opening in the railing that seperates the buffet line from the seating area near the door might be for emergency access (in or out?). On our last cruise we only went to the starboard side buffet line for breakfast, so maybe
DCL has reconfigured the port side - I remember a railing / 3/4 height partition on that side between the seating area and the buffet.
And I am not really trying to be argumentitive here, nor supporting or not supporting the OP's situation. I just commented on my observation that at topsiders and in the parks there are a LOT of people saving tables for people that are standing in line at the buffet or lunch counter while there are a lot of people that are trying to find someplace to sit down and eat because they have their food. And I think that the way the Imagineers layed out the restaurants assumed that groups would get in line for their meal, then go find a place to sit.