[Mithadan]

Just noticed this thread. I have always assumed that Orcrist was Ecthelion's blade, just as a matter of notoriety rather than deduction, though there are nice analyses here. I like ecthelion's discussion of why Orcrist would have been of great repute.

Tuor is likely out. You would assume he carried his blade with him, so it would not have been part of the spoils of Gondolin. Same applies to Glorfindel; that blade was likely lost or broken when he fell during his duel with the balrog, so it also would probably not have been part of the spoils of Gondolin.