Game 5 LeBron played nice D on the interior but throughout the series he hasn't been this game-changing force on D. Outside of game 5 his defense was a non-factor, he had mostly been conserving his energy for the offensive end and guys like Shump, Delly and Tristan were exhausting their energy on that end.
Kyrie's offense has been more of a factor in the win/loss column than LeBron's offense and defense put together. If Kyrie doesn't explode in game 3 or 5 then the Cavs lose the game, reason being because he doesn't have to hold the ball and stagnate the offense in order to get his buckets. He can score quickly.