Well sure. That's exactly what I would expect.
If draft results are completely randomly distributed (meaning that nobody is inherently better than anybody else at finding good players in the draft), we'd still expect the teams that drafted better (meaning they were luckier) to end up having better records. They got better talent, after all, even if it was by luck.
Look at it this way. Tom Brady is a huge part of why the Patriots rank high on this draft list, AND why they've been so successful on the field. And he was a guy they took a flyer on in the 6th. Did they have some major insight that other teams didn't? I highly doubt. It's just that somebody had to end up with him, and it happened to be them.
Do I think it's really this simple? No, I don't. But I suspect that a huge part of "draft success" has a lot more to do with the coaching that happens after the guys show up than it does with some ability that only some teams have to identify great talent in the draft. If Tom Brady had ended up on some other team, it's entirely possible that he gets buried in the depth chart, poorly coached, and never turns into a starter, much less a star. Getting talent is one thing, putting it in a position to succeed is another.
