It was said that Lebron James didn't have a clutch gene. I just think that the Cavaliers management completely failed to build any sort of supporting cast for James and he was essentially forced to win championships on his own. Sports commentators felt that was an excuse to not put him on the same level as Michael Jordan or Kobe Bryant (never mind both men did have supporting casts, Jordan had Scottie Pippen, Horace Grant, and Toni Kukoc, Bryant had first Shaq and then Pau Gasol). Even the best players in NBA history can't win championships on their own. They need others to help them.