The future is always uncertain, but the short term returns on Luka Doncic to the Los Angeles Lakers already look better than some would have forecast. While he isn’t up to his highest previous standard of play yet, the reduced burden and additional space being enjoyed by Lebron James is already evident in his play. You’ll find no predictions regarding the rest of the season here, but it is a healthy reminder that complementarities are harder to anticipate than substitutes. The possibility of substitution between inputs is more than anything else revealed by their sameness, an attribute that alllows revelation by comparions. Complementarity, on the other hand, is far more complex and often obfuscated by the near infinite ways two or more inputs can be different. Substitutes can be predicted with information and attention to detail, and is therefore more easily reduced to a repeatably applied formula. Predicting complementarities demands more bespoke creativity, an art that is far harder to differentiate from luck.