Is it possible that Riddle is who he is because he didn't have a Grindelwald? Dumblefore had the magical carpet pulled out from under him with that whole ZOMG-WE-KILLED-MY-RETARDED-SISTER thing, and Riddle just didn't have that kind of guilt forced upon him at any point. Instead, he lived secure in the delusion that the world revolved around him and at the same time was constantly attempting to thwart only him. *Shrug*
Re: *rises, all ghosty and mist-like*
Also: Hey girls, good to see you around. <3