Brainstorm questions look casual, and they are scored as hard as anything else in the case. They're also where you can most visibly separate yourself: structure is the price of admission, and a genuinely good idea nobody else mentioned is what the interviewer remembers.
Recognize the cue
Brainstorms hide behind many phrasings: "What are some ways the client could market this?" / "Why might costs be rising?" / "What risks should we think about?" / "What else could explain this?" The tell is that they're asking for ideas in the plural, not a calculation or a structure for the whole case.
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