Rubels for Rudel. You mean rubles.
I think that this guy was obviously quite tough, but it is also impossible to say who was the single toughest guy in a war, especially because of their accomplishments. What if a pilot of a Brewster Buffalo in the Dutch Air Force was the toughest, but he got killed quickly because of his crappy plane? Or what about an American merhcnat sailor, killed by a German U-Boat? All kinds of things can determine toughness, not just accomplishments, albeit they are hard to measure.
Steele