On the McKinsey website, it is mentioned that there are many possible answers for brainstorming, structuring, and exhibits. Even for math questions, making a mistake does not necessarily mean rejection. Additionally, I found that MECE doesn't just mean covering all components but actually focusing on the important levers for a problem.
Given this, how does McKinsey evaluate candidates? How do they eliminate bias if there is no single right answer, as one structure may be preferred by one interviewer but not by another? Is the evaluation primarily based on the thinking process and communication skills?