Don't yield to this one yet BD! Let me know if you're still mulling over the odd characteristics of this one. Oh btw, it's a real head slapper, so be warned Though progress has certainly been made in several respects to this riddle, I'd recommend using a completely different method for finding the answer than has been attempted so far. Try looking in a new direction
and yes, this post is literally riddled with hints (except for this line... or is it?)