The Clips lost DJ, but they still have Chris Paul and Griffin, and if they sign-and-trade for Koufos as suggested, the dropoff will be less than most people think.
The Clippers can't sign-and-trade for Koufas; who would they be trading to the Grizzlies to make it worth their while? Outside of Paul and Griffin, all they have is roster flotsam and jetsam. Despite that, I still think the Clippers will be better than Portland assuming Portland does lose Aldridge.
That said, the Lakers still project to be a worse team, IMO, as does Sacramento. Acquiring Rondo isn't a good thing; I was wrong about him when he first entered the league, but I came around and thought he might even be a Hall of Fame caliber point guard...until the injury cut his peak and prime short. He's been declining every year since then. He has a lot to prove and no longer has the ability to prove it. Plus, Sacramento is far and away the worst-run franchise in basketball. They destroyed their own season last year by firing Malone who actually had Boogie playing well and their front office operations have been borderline arson ever since; I have little doubt they'll find more ways to suicide their franchise.
The Timberwolves are pretty high variance. I like Karl-Anthony Towns, I like Wiggins and I like Rubio, but Rubio probably isn't even money to play a full season and has to do more than play a high assist/high turnover game to be a great player, Wiggins is extremely talented but was largely a low-efficiency gunner last season and Towns is a rookie--it's the very rare rookie that anchors a team as a foundational star. I could see a scenario where everything snaps together for those guys, but I could also see Rubio being hurt again, Towns struggling as a rookie and Wiggins still not yet becoming an elite scorer.
All in all, I doubt Portland will have the worst record in the West, but it's not impossible. This is one of the most talented conferences I can ever remember seeing, so if they are the worst, it won't be the same level of indictment that it might have been in other years.