His name may not be misleading, maybe we just focused on the wrong part. Abaddon has to do with lost souls. Locke and Hurley both are lost souls in a way. Abaddon could be a positive force in helping them find their place, presumably the island. It was kind of foreboding when Abaddon parks lock at the top of the staircase though...would've given me the willies if I was John...