They'll be a top defense for a couple of reasons, I think.
1. I absolutely hate the terms that this had to happen under, and I'm not saying I didn't like the guy being on my team, but Darrent Williams shouldn't have been a #2 corner last year -- obviously, I'd love for the guy to still be on the team, and certainly with us, but it was a lot easier to avoid throwing to Champ with Williams opposite of him. He'd have been a great nickelback, but I'd rather have seen Foxworth playing opposite of Champ. Given the choice, I'd rather have Williams over Bly based on the circumstances, but purely from a football standpoint, Bly is a very clear step up. Though I'm not sure that Williams was entirely the problem because of reason number 2.
2. Larry Coyer's gone, and replacing him is a guy with a very impressive track record, Jim Bates. He's not technically the defensive coordinator, but he gets the final word in regards to defensive strategy. I stand by the fact that Coyer was at the very least one of the worst defensive coordinators in the League. The defensive was great, teams adjusted, and Coyer didn't, and then the defense struggled a great deal. He also tried to play Darrent Williams like he was Champ Bailey -- well off of the line of scrimmage -- and it left Darrent to get destroyed by double routes. This one, by the way, is the absolute biggest reason. This guy was a complete failure when it came to mid-game adjustments.
3. The defensive line is improved. That was the biggest weakness. No matter who's playing corner, any time the QB has 5 or 6 seconds to find an open reciever, he will. Jarvis Moss and Simeon Rice, if he's healthy, give the team the pass rush they've lacked.
Unfortunately I missed the game so I can't speak intelligently on anything that happened today. But for whatever reason the Broncos have always had the Patriots number and then the last time they played, Brady would not throw the ball to Champ Bailey's side. That'll change with Moss, but if any team has the guy's on defense to stop the Patriots it's Denver.
I just hope that QB's still have the idea that when they get near the goalline, they can just throw a jump ball to whomever Champ Bailey's covering. That never ends well for the other team.
They should be dramatically improved. I hope they can be "scary good" like they were early last season. Al Wilson was a big loss but it sounds like DJ Williams filled in nicely at mack, which I expected he would.