1. Anthony Davis
Russell Westbrook had such a negative impact on Anthony Davis last season when he was healthy. Granted, Davis missed most of the year with injury but when he was healthy and played with Westbrook it was not pretty.
The Lakers had a serious problem with Westbrook at point guard when it came to floor spacing. Westbrook is a horrible three-point shooter and he is someone who loves to drive to the rim and initiate contact. That does not mesh well when you have Anthony Davis and a traditional center like DeAndre Jordan or Dwight Howard.
Since Westbrook cannot shoot and Jordan and Howard are traditional fives, Davis was the one that was tasked with adding floor spacing to the team. The result was Davis being the worst jump shooter in the league before he got hurt with numbers that were down across the board.
Davis played better when he got healthy as the team stopped using the traditional centers and realized that the only way to maximize Davis with Westbrook was to play small-ball lineups. That being said, Davis and Westbrook still had a -5.4 net rating when on the court together last season.
Kyrie Irving is a significantly better shooter than Russell Westbrook and while he does still like to drive to the rim, the threat of him actually being able to shoot makes the floor spacing exponentially better for Davis and the frontcourt.