What race was Legolas?

[Legolas]

I'm basically trying to get across to you that Silvan Elves are not a kindred,

You don't have to 'get that across to me' - I never said Silvan was a kindred. I said Sindar is a kindred (but even then, it's really just a subdivision of the Teleri). I'm aware that Silvan is a description...that's why I said Legolas was Silvan by culture. Additionally, you can look back further and see that a "kindred" really is just a description in itself, as Silvan is. In the beginning, 'Vanyar,' 'Teleri,' and 'Noldor' are not defined by anything other than who chose to follow - Ingwe, Elwe/Olwe, or Finwe. Same for every other 'kindred,' 'subkindred,' 'division,' or anything else you want to call the different groups of elves.

Though the Silvan elves were more or less exclusively Nandorin in their beginnings, this had obviously changed in the Third Age. Thus, you don't see any Silvan elves identified by their traditional 'kindred' names from earlier ages (whereas the Teleri by the sea and the remaining High Elves continued making such distinction) because they had blended together. "Silvan" was never formally acknowledged as a "kindred" but effectively it was its own new kindred, or lack of kindred...the elves east of the Misty Mountains simply became Silvan. None were differentiated further save the rulers - Celeborn and Galadriel, and Thranduil and his son. Mithrellas, for example, the 'mother' of the Princes of Dol Amroth, was simply stated to be 'Silvan.'