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Do you have any evidence that first cousins were allowed to marry if there other parent were not kin? This seems to go against what we know with Maeglin and Idril. Maeglin's father was a Dark Elf related to the Noldor, but Idril's mother was of the Vanyar. In fact Idril was more Vanyar than Noldor.
In the case of Galadriel if we are to accept that Celeborn was the son of Elmo then there is no problem since they would be second cousins and not first.
Also I don't think it is correct to associate Malgalad/Amdir with Galadon. If this was the case they would be close kindred with Elrond and more would be mentioned about this. I find you are unnecessarily shrinking the Sindar royal family and erasing characters. Amdir/Malgalad can easily be a prince of the Sindar without being so closely related to Thingol as to be his great nephew.
As for Nimloth surviving the sack of Doriath, this seems quite unlikely. We never hear from her again. It is perhaps more likely she was killed in the destruction.
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