Relative Powers

[Legolas]

Is there any reference that anybody else knows of as to the nature of this second Gothmog? I fear that I was influenced by a certain Avalon Hill LotR game which named one of the Nazgúl "Gothmog". I thought that perhaps they based this decision on some authoritative documentation. My mistake.

There are several threads here that argue Gothmog's race - orc, man, Nazgul, etc. To me, the safest conclusion is that he was not a Nazgul because he was never explicitly stated to be one.

EDIT: But it occurs to me that Lúthien never made it to Valinor (except for the Halls of Mandos which don't exactly count), so cannot be considered as one "of Valinor". Therefore, I take the liberty of leaving her at a superior position to Galadriel. I recall now that my original reason for holding her as above even Fëanor, was that she was born of the union of Thingol, one of the three Eldest of the Eldar, and of Melian the Maiar. Being half-Maiar places her above any other Eldar, seems to me.

That's what the 'Greatest of the Eldar' thread oblo linked to above points out. Tolkien speaks of Feanor and Galadriel as the greatest of the Eldar of Valinor, and notes that Luthien is the greatest of all the Eldar:

Who together with the greatest of all the Eldar, Lúthien Tinúviel, daughter of Elu Thingol, are the chief matter of the legends and histories of the Elves.