A lot of the top historic superstars added significant areas to their game after they already were at an MVP type level. They got to a point like that, but they realized that to win championships or even maintain MVP-level play as they aged, they had to work on their weaknesses. Shooters learn to pass, defenders learn to shoot, etc. Durant is an example of someone who really improved his defense. Luka is going to have to try harder on his weaknesses, such as defense, maturity, and leadership. Where he needs to be on defense probably would require a hard-core lifestyle change of diet and conditioning, and is he willing to "try" that hard to work on a weakness?