Aaargh! I wrote a reply and then managed to select almost all of it, unnoticed, whilst inserting a comma and lost it! The gist of it was -

I think you are right - my Legolas is a bit of an amalgam, and also 'mine' - Tolkien seems less interested in Legolas than some of the others, his personality is sometimes less defined than theirs.

However, he is a prince, so used to giving commands when necessary; he has life experience through being older by centuries than the rest, even though Tolkien never specifies just what age he is; and there are other warriors available to Elrond, but this is the one who goes. So I think he must be reasonably intelligent and able to come to conclusions from observation!

But it might just be because I like him that way. :~)