I think Dugger is a better player than Peppers. It might not have looked like that last year because Peppers got to play a true SS role while Dugger had to do the FS stuff. They're both SSs in an ideal world so I've bene on the train we should let one go to be replaced with a FS. Dugger being the FA, it was logical to me he'd be the one to go. I figured you let Dugger go, sign a FS and try to extend Peppers.
That being said, even if it wasn't ideal, it was far from a CRIPPLING weakness last year so it's not awful to keep playing them together. And since Dugger is the better player, you can plan to let Peppers go next year if paying them both rather than allocating some of those resources to a complimentary FS type is a problem. Especially if there isn't the guys at other positions to spend on in FA this year, it's not a bad way to allocate funds.
Ultimately, this team needs high end talent. I think Dugger, if allowed to be a true, full time SS is a potential borderline pro bowl guy at SS. So I'm fine keeping guys like that since we desperately need some cornerstones. Personally, I don't think Peppers is all that far behind him and he's only 1 year older so I'd rather just extend Peppers, presumably for less because you'd be doing it a year ahead of FA, and then put savings towards a FS. But what you'd like to do doesn't always line up with the guys available and the contracts they'll sign for.