To argue against myself (which I have the greatest joy in doing) the statement re Feanor says he was made the greatest of the Eldar, not that he was, at least in the end, actually the greatest. Melkor was originally made the greatest of the Valar, but he subsequently fell from that position through his own actions. The same could be said of Feanor.
Of course, that doesn't clear things up, as Luthien (as I stated earlier) is not technically one of the Eldar (though the Eldar claim her as one of their own). She was half Eldar - half Ainur. Of course she would be 'greater' in terms of sheer power than Feanor, simply due to being half divine. Hence, Tolkien is technically wrong to class her as greatest among the Eldar.
Its equally true to say that Shadowfax is greater among equines than Bill, but we're not comparing like with like, so the comparison is ultimately false. Remove Luthien's divine aspect, (ie put aside those things she could only do due to that divinity) inherited from Melian, compare her to the 'unfallen' Feanor, at the height of his power & who is superior then?
This is my point about taking into account what isn't said as well as what is said & not taking statements (even ones by Tolkien) at face value.
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