I don't think it's a question of "better." I think it's an issue that, like the Clips and Bucks, the Pelicans match up better with longer, more physical players than Denver, Dallas, or the T-wolves.
Whether or not the Suns escape in the next two games, they HAVE to rebound as they did in Game 5 (and even then, there were times that three Suns stood there while a 'Can slipped in between them; they HAVE to get better offense out of Cam Johnson and another good performance out of Payne. (Personally, I would have left Payne in with five fouls. He was uber hot.) At some point, Crowder has to start making some shots.
We can with without Booker, but the two Cams, Crowder, and Holliday need to play well. And take the pressure off Paul in the first half. He was so tired last night that he missed all but a couple of shots in the second half.
The Suns need to remember that DEFENSE brought them here, and the playoffs are all about defense. That's why the "bigs" lineup worked in brief spots.