I agree that Kampmann is better in just about every facet against Diego, except in one huge aspect.
I like Kampmann, and I think he has the tools to be a top 5 welterweight physically, but I think only Mike Thomas Brown, Leonard Garcia, and Dan Henderson rival Kampmann is terms of extremely low fight IQ. This is where Diego will win.
I'll never root for Diego, and he's one of my least favorite fighters, but if there is something he does have, it's an iron chin and incredible heart. He'll be able to bully Kampmann with his pace, and Kampmann will play right into the gameplan that Greg Jackson sets to work against him.
I see Diego taking a second round stoppage, or a decision win.