Final answer:
The statement is an opinion and does not belong in a summary because summaries should be objective and focus on the main points, not personal interpretations or minor details.
Step-by-step explanation:
The statement 'The youngest son was very brave for facing the bull and finding the crystal ball' does not belong in a summary of the story because it is an opinion about the story, which is not suitable for a summary that should be objective. A summary should focus on the main points of the story, including the author's main point, major conflicts, and key events. Such personal interpretations or minor details that do not contribute to the central narrative should be omitted to maintain a concise and accurate overview of the storyline. When summarizing, it is important to distinguish between major and minor details, and to avoid injecting personal opinions or non-essential information.