I also posted in the Dunn thread. Unfortunately for Dunn, his batting average still stunk (.204), and his OPS was barely over .800. This year really does not compare favorably to either of his years with the Nats in terms of offense. He tailed off after the All Star game (.729 OPS).
Rodney had an amazing year by any traditional measure and most advanced ones. Personally, I view him as a never was, so I don't think it meets my idea of a "comeback." Also, he might not even have been the best reliever in his own bullpen (Jake McGee has a case on FIP).
Oh, as for the "Delivery man of the year" award? There's also a DH award - the Edgar Martinez Award. Dunn does not get that, either.
Chief / Cal - I'm surprised you two just didn't make your best argument - WAR improvement. Dunn went from -3.0 to 1.7, an improvement of 4.7 WAR, while Rodney went from -0.2 to 2.4.