"Who would you start a team with" is a slightly different question than the one that was asked. Different people can interpret how much of team fit or off the court culture/attitude reflect in that original "better overall basketball player" question, but undoubtedly NBA GMs will place more emphasis on those non-basketball factors. Klay definitively has a huge edge in those areas.
Spacing is hugely important and shooting is hugely important, but it's not as important as primary shot creation. Those are things you can get from role players. You talk about how the playoffs show what is important, and without a doubt every year it shows that primary shot creation/offense generation is the most important thing, and it's not something you can reliably get from a role player.
Klay does not offer that at a high level. Butler is not in the very top tier, but he's well above Klay in that regard.
