As for the Suns, I'm just waiting to hear after the season what was secretly going on. Whether someone was secretly injured (Chris Paul's hand again?) or sick, or whether the Suns' well-known public image of collegiality (e.g., they liked each other) was a lie all along and key players actually couldn't stand each other. (Don't scoff, it's very plausible that we have been fooled about the personalities. It's happened before in Suns history.)
I'm also curious to learn what the explanation ends up being. But I suspect that part of it is that the Suns rely so much on one another as teammates that they lack individual toughness.
Paul is probably the only truly mentally tough player on the team, and he's either worn down, injured, or both. Booker talks the talk, but the reality is that his performance usually suffers when he gets too focused on asserting himself. Crowder is tough in a sort of alley-fight way, but his toughness, like Booker's, rarely translates into improved on-court performance.
And the rest of the roster is just soft. Even McGee is more of a "gentle giant" type.
In both series so far, role players on the Pelicans and Mavericks have stood up and made the Suns fear them. They've impacted games beyond what their slotted contribution was supposed to be. They've risen to the challenge of the moment, stared the Suns down, and outplayed them.
It's not just that the Suns haven't done that -- they don't have personnel who
can do that. It's not their culture. They are hard-working teammates who sing and dance before and after games, who trust each other and pick up one another when they're down. They don't have players who step on the floor and say, "Eff you, this is a war, and I'm taking you down
personally because you're in the way of what I want."