Fair enough, Jim. Statistically, he's not been terribly impressive. However, I would argue that in watching both New Orleans' games to date, Bush is incredibly valuable to what they do. They have him lining up all over the place. And to watch defensive personnel respond when he goes into motion. It's damn near a mad scramble.
Bush certainly generates concern when he is on the field. While he has yet to break out himself, he has definitely impacted their offense. They can basically play pitch and catch so long as Brees has time.
Back to this defensive end vs. running back debate...
Who doesn't love a great runner? A great player of any kind is not easy to find. Hell, an outstanding kicker. Tough to get.
But running games today are more a product of what is around the runner than the actual talent of the running back. See offensive line. See the weaponry flanking a runner.
Arizona can bring Jim Brown in there and until certain matters up front are addressed, he will not be averaging 5.2 per rush - as he did for his career. Or whoever.
An immense pass rushing talent, however, will find his way to the passer. An offense may try and counter that by helping out, max protecting/sending a limited number of receivers into the pattern. And that defensive end will still impact the game.
That is why this is an easy choice for me.