ExLS dimensions are about the same as the self defense length ones in depth. The main difference would be in 8 cells vs 6 cells wide.
Yes, the space still belongs to Combat Systems Dept.
There might be a version of this where there is a single RAM placed on top of the flex/hangar space. Another option is that the ExLS space turns into the mount for the RAM to get it higher, and that mount space underneath becomes the magazine or tool locker for the RAM.
Or its just left for future equipment growth, which is not a bad idea either.
We don't actually know where the RAM will go, and are assuming that it will be placed where the CIWS for the Hunter and City class are placing them (amidships port and stbd). Perhaps they have another more optimal location in mind Iike I stated above, and will have a single launcher instead of two.