The RFI response sounds like the designers investigated your question and found that they fouled up the design...and they're grasping at straws to avoid a big change order. Counting on 2 doors to be open so that you can consider something "in sight" as a real stretch that I wouldn't allow.
But; that being said, the RFI response has given you your marching orders and if it's later found to be wrong, it's THEIR liability.
