Interesting ideas! I had never thought about that but that would make it more surprising if the laser dish didn’t even look complete.

I was trying to think of what could fill its place, and after some googling I stumbled across this art station post from a concept designer who helped model the Death Star in Rogue One.

Maybe something like this could fill that gap instead. The one thing I like about this idea is that it doesn’t really take away from the Death Star II’s iconic silhouette, and instead it could actually add to its ‘incomplete’ look, as well as differentiate it more from the first Death Star’s design.

Are you wanting to remove Luke’s hologram in order to save our first look at him for when he actually appears later in the film?