Final answer:
It is not possible to determine which school administrator doubted Sonny's rocket success based on the provided details, as no specific administrator is mentioned in relation to his rocket activities.
Step-by-step explanation:
The student's question asks about a school administrator who did not believe in Sonny's potential success with his rockets. Based on the context given, no specific administrator is directly mentioned as doubting Sonny's abilities with rockets. However, the reference to teachers not wanting to modify work during elementary school suggests that some educators had doubts about Sonny's potential or were not fully supportive of his needs.
It's important to note that the other individuals mentioned, like the gym teacher and participation on the football team, indicate support and encouragement during the student's high school years and do not directly relate to the question about rockets. Therefore, without additional context specifically tied to Sonny's rocket endeavor, it would be incorrect to infer which school administrator did not believe in his success with rockets only based on the provided details.