but it did not give the fighter anything unique, just a bonus. Everybody can do damage, fighters do +2. In DDN, while fighters can use the expertise die to do damage (like rogues do with sneak attack), fighters can parry, which is unique to them, so far at leastTechnically, they had a couple of fighter-only feats, like Weapon Specialization.
Nod. There were only a couple of Fighter Bonus Feats that let you trade out BAB the way CS lets you trade out damage - though, sans feats, combat maneuvers often came at a penalty, anyway. CS is a nice system for what it does, but what it does is very much what the 3.5 fighter did. It's adapted to a new system, and, perhaps, that makes it a bit more consistent in how it does it, which is nice, but not, IMHO, really 'innovative.'
Imho, it is innovative in the same way Edison's light bubble or the iPad were innovative. They weren't the first try at it, but they were the first try that worked.