Even as he retired from football, Kurt Warner couldn't help but be concerned about the team he's leaving behind. The Arizona Cardinals' fledgling success directly correlated to the rhythm of their passing offense, directed by the 38-year-old quarterback with perhaps the most improbable rags-to-riches-to-rags-to-riches story in professional sports history. But now he's gone. "I don't think you can help but think about that," Warner said of the predicament his retirement could bring the Cardinals. "That's the hardest part for me." However, thanks to Warner, a two-time league MVP, at least a model for success has been built. "It's important to...