that's a lot of assumptions to unpack
start with the notion that some of Portland's players are better than they were when the Blazers got swept by a 6th seed when Blazers had HCA, so somehow...that makes Portland a true contender?
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another thing, it's true Nurkic was better last year than he was the year before. But why would anybody believe that Nurkic will be better this season, or even just as good by the time the playoffs roll around? Nurkic was injured in his first 5-on-5 practice about 7-10 days ago, and hasn't practiced again since. It's looking like he might not play till March and that's only 6 weeks before the playoffs start. And he'll very likely have a minutes restriction when he does return. He will have been out for a year....he's not going to be returning to form quickly
also, having 2 big C's sounds great, but the way the playoffs have gone the last few year is that almost every good team has small-ball lineups they use a lot, and use successfully. Gasol only played 30 minutes a game in the playoffs for Toronto last season. Anticipating that Whiteside/Nurkic will be able to split 48 minutes a game is simply not realistic
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besides that, when Dame is picked up by the defense at halfcourt, and doubled outside of the arc, it's not going to be a C that comes out to the 3 point line, receives the bail-out pass, and solves the riddle that CJ, Curry, Napier, Aminu, Turner, and Harkless haven't solved. Nurk and Whiteside don't have the skillsets to do so. And neither do Ariza, or Melo, or Simons, or Trent