Just because Aragorn says most of the speech doesn't necessarily mean that he says all of it. They could piece the different quotes together to achieve a certain effect. That is the whole idea of a trailer. They put together a bunch of shots (and quotes) from the movie, that really define the movie. If Theoden says one thing and Aragorn says another, and they're both about the same thing, then they will naturally be put together on the Trailer.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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