Agree about the destinations-
Dalaman, Larnaca would have been operated by Monarch as would Palma and they might be able to source capacity elsewhere for the latter.
Maybe the others are where they perceive they might be able to add capacity from a London area airport. As you say if these don't reach expectations, they may be able cancel the sub-chartered aircraft so needs to be treated with caution but welcome nonetheless.
Now it's laid out in an easier to read format what I said about Saturday in my last post looks to be true for Sunday.