Further thought on the Problem with Elves: There could be real truth to what Lucas says about Kha living out of his culture. His link to Sil could be based not only on his moral choices, but also on his mixed heritage. Mages among Elfkind might bear special stigma, or special status (which would make Lucas an outcast among his kind, even as he cants about Kha's heritage rejection). (And doesn't he do this with Anver around? So Anver has to realize that Kha is half-elf.)
Pity we don't meet one or two others. (Are they susceptible to Horrors?) (Do they have links to Behira or Saundon or anyone else?)