A few points:
1. The pool in which the Watcher resided was artificially created. Remember? The pool level was low -- that's why the Fellowship could get to the door at all.
2. Sauron's henchmen (hench-orcs?) dammed the pool in the first place.
3. How did the Watcher get into the pool? Did the orcs haul it up from some forsaken underground lake deep below Moria? It probably didn't crawl up there by itself -- or did it? By Sauron's command?
4. Where did the ugly critter come from?
I think if you can answer the question of the Watcher's nativity, you will answer the other questions regarding its allegiance to Sauron, etc. [img]smilies/cool.gif[/img]
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