Doubt that the visibility from the lower deck would be any good, especially since its located right behind the RBUs. The windows are probably in line with the raised forecastle. But you could be right, these ships do have C2 facilities for senior officers.No clue. My guess is one is the captain's bridge while the other is an admiral's bridge. The second bridge could play a strategic role that requires isolation from the "plebs" sitting on top. The SFC could operate from there, or Naval HQ leaders making command decisions for the rest of the navy when acting as a command ship. Civilian leaders from the PMO could also operate from there.