I think the comments pointing out how Teir is biologically related to other elves is simply to help him realize that he's not some abandoned outcast. I don't think they're trying to say, "oh hey, Windkin is totally Dad now, screw that guy who raised you!" just, "hey, you have another family here, and that's us, and that's rad." It's to foster a sense of belonging when he didn't have one before.
Tavie said: Maybe whoever said it just meant "last" as in "most recent" to distinguish from the earlier, Ardan-killing gunshot?I believe that was me, and yes, I meant "most recent," not "no more bullets." :)