Another thing that came to mind is that we really don't see the bond between Eomer and King Theoden. Sure, there's that 'the King stands alone' line, but we don't see these two (to this point) really interacting. What better place to show that Eomer was a 'king's man' all along than at Helm's Deep? Also, we would then see why Eomer would be a worthy successor - not just that he carries a big stick.
But that may have been too much for the audience, and so we have what we have.
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There is naught that you can do, other than to resist, with hope or without it.
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