in the comic book "blade (vampire hunting vampire)", whistler is the same name of the guy who makes a lot of vamp killing weapons and the one who raised blade (also has a soul).
i always wondered if the name usage was supposed to be the same one, or just a coincidence. if it is supposed to be the same one, i assumed he went on his way to raise blade and stuff. it could have been, since he was young on buffy, but really old in the blade comics.
but if it was just a coicidence, i have no idea what could have happened, he seemed like a "vampire watcher".