Well, I wouldn't doubt Anderson's numbers without Doughty were terrible because he and Bjornfot were out there facing top competition when Doughty was out. You would likely see that from any really young paring. Mikey isn't being carried, you can see how he and Drew's numbers have both increased since they've been put together. Drew is having a career season without question, and that doesn't happen when someone is carried.
If you want to see what carried looks like, check out Drew's numbers after he started playing with Forbort. Year over year drops in possession, productivity, and so on. I went round and round with a particular poster about how McNabb should be the one we were protecting and not Forbort, because he was the better player and Drew was having Norris level seasons next to him. Of course McNabb was the resident whipping boy at that time, so I got called an idiot quite a bunch. While calling me an idiot is pretty accurate in many instances, we saw how that turned out. Certain metrics just don't lie, and Anderson is incredibly strong in a lot of the departments that make a good, responsible partner. He's not a world-beater and he's never going to put up big numbers, but he's going up against the best the NHL has to offer at 22 years old and succeeding.
I don't think Durzi/Doughty would be a bad pairing at all, but keep in mind those instances where Doughty and Durzi are together are when it's late in the game and the team is pressing for a goal. They are pushing forward and taking risks, and other teams are in contain mode. I think those would change quite a bit if they were an everyday pairing and not just used together in specialty situations.