To take this outside of sports so we can all relate better.
Company A has a boss who fires employees who aren't top performers, even though they are competent at their job.
Company B has a boss who is honest with employees about their shortcomings, and works with them to help them improve so they can maybe become a top performer.
No one wants to work for Company A, the culture sucks becuase everyone is worried they could be the next one fired. Company B is much better because the boss shows they truly care about their employees - this motivates everyone to perform at a higher level.
Companies with good culture and high employee morale consistently outperform companies with poor culture and low employee morale.
Much like business, basketball is a team game. If the team is not bought into the culture, then no matter how talented they are they will almost always come-up short of expectations in the end. And the team / future recruits won't buy into the culture if the coach consistently says one thing and then does the other.