I've always thought that way about CP3. Dude's a great player, really good. But I'd be lying if I didn't question his "leadership". He gets super bitchy on the court etc and I could see that being his personality. Where you kinda need a more dominant ego to keep him in check to go on a title run or something. There are a ton of variables to success, including playing in just an incredibly loaded West, but I'm surprised they didn't have more success. Also in fairness to him, you probably have to be a pretty incredible motivator to get Deandre Jordan & Blake Griffin to buy completely in and really bring their shit. Those guys just strike you as the epitome of "Cool making money, I'm in LA, sweet. Oh I'm injured, let's milk it". Blake has a little of that Dwight Howard shit. More entertainer than ruthless athlete.
I've also seen a ton of rebuttals about CP3 in San Antonio. That his game isn't free-flowing enough to match up well in the Popovich system. Kinda surprised me, but there may be something there.