I don't think the Chiefs are going to be quite as good as last year. That doesn't mean they won't be able to make the playoffs or anything. I think the Chargers actually have a very good chance of winning that division even. IF Luck is healthy, the Colts could make a serious run at it. I actually think the Texans may surprise some people too. Lots of talk of the Browns breaking out, but I've so far been more impressed by the Steelers still in that division. They seem balanced, and pretty deep at a lot of positions.
As to Brady, he's still an elite QB, in that he can win games for you, by performing at the highest level when it's needed most. I mean, if he's not a top 5 QB? Who is? We could say Mahomes, a healthy Rogers, maybe a healthy Luck, probably Brees are usually better, they are better statistically. Who's next Wilson? Ryan? Rivers? Wentz? If we were able to draft, and I was able to have first pick, I'd still consider taking Brady. Now, at some point, like Brees, and Rivers, he's going to fade just enough, likely in arm strength, plus any mobility left, to where he simply won't be as effective, but even then, could still win games for you (think Peyton Manning in his last season, Joe Montana for the Chiefs, etc.).
In the NFC, I still like the Rams, but I also like the Eagles if Wentz can stay healthy. He has all the tools there to have a MVP season. I could see them ending up in the SB again actually. Of course the Saints with Brees, presuming he still has it, they also have a certain motivation perhaps, having been burned last year. But by the numbers the Falcons could be quite good. I also think the Bears will be very good again, their D is solid and deep. Trubisky by every guess is headed for his best season yet. Curious how well both the Vikings and Packers play. Both look like they could go 11-5, or 7-9.