Vestigial usually refers to traits which over evolution have lost their main function and are less useful than they once were.
In number one Hunter means that he thinks the teeth were from the ancestor whale shark but are now useless or nearly useless to the current whale shark.
. Fire constructed the doorways, so there was no prospect of escape.
In the gift of the magi the summary is giving up something that means a lot to you for someone you love because even when something is so important to you a loved one means more
