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Eh... "smart" is a little too vague and subjective of a term for me to believe. Your rank in your class is determined by a grade score, not some metaphysical gauge of natural intellect. Eru can be the top of her class through effort as well. She doesn't have to be naturally smart like Houtarou at all.
For example, take the famous Dr. Watson. As evident by his doctorate title, he should be "smart," but he is still overshadowed by Sherlock Holmes who comes from a less distinguished background.
In the same fashion as Watson and Holmes, I think Eru just serves as a foil to bring out Houtarou's talents, which would normally go unrecognized by the public eye.
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