Obviously all of the absolute all time greats (even regular players) will believe in themselves as players and competitors because that’s how they got to this stage.
But LeBron also posses some of the best basketball IQ of all time. Do you think he genuinely thought he and the Cavs could beat the KD Warriors in a 7 Game series?
Have you ever played competitive sports? I’m a far cry from Jordan/kobe mentality but there are times it doesn’t matter how stacked the odds are your brain just can’t accept that you won’t win.