There are huge limitations to what is possible with the mission editor WRT battles like this. There is no way to remove ships from groups except by sinking them with enemy units. Such sinkings only exist if a player is within render range—if not, they never happen.
So if there is a group with 4 jap CVs, and the group heads back to the barn, you'll see the 4 CVs that should have been sunk.
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