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In the epilog it says only that Moria was not jet taken when the conversation between Sam and his doughter took place. Some HoME volumes later we get the original scripts for the Appendices and there it is clearly statet that Durin VII son of Thorin Stonehelm reestablished the Dwarves in Moria.
On the topic, I think that the watcher was one creature. And if I had to choose I would break the dam and try to kill the watcher when the water is gone.
Respectfullly
Findegil
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