I think the Devils have some pieces, but they still need a few big pieces before they are anywhere near believing they are out of the rebuild stage. Ty Smith can't be it on the back-end. The Devils need to acquire another 2-3 high-end young defensemen, and probably also someone better than Smith. He can't be the best defensemen on a real cup contender. I think the forward core for the Devils looks like its trending in the right direction and they have a quality goalie. However, I think even you'd agree that another two years of drafting early and building up that defense is the Devils current stance before they can believe they are a real playoff contender. And then we'll see how good their core is. Hughes, Hischier, Blackwood, Smith are some good pieces. Are they going to be good enough pieces to be a real Cup Contender? Still to be seen.
Meanwhile, I think the Rangers are at the stage where they have the main pieces needed already. It's mostly a matter of them being young, and that you can't expect them to instantly be difference makers. It might take a few years for these players to come around. I'm also not suggesting the Rangers don't have some problems outside of the players, as well. I'm not suggesting either that the Rangers are penciled in to win Cups, but they are ahead of the Devils in their rebuild. I'm not convinced by the coach or the GM of the Rangers, but I think looking at this objectively there are still those same questions on the Devils side of things.