Final answer:
Without clear information about Hina Talib and Shelby Harris's positions on school start times, we cannot determine who advocates for eliminating early school starts based on the provided texts.
Step-by-step explanation:
The information provided does not clearly indicate whether Hina Talib or Shelby Harris argues for the elimination of early school start times. Instead, the referenced texts discuss various educational studies, disparities in educational policies, and issues surrounding school choice and privatization. Minority parents' concerns about early school start times affecting their children disproportionately are mentioned, but without specifying any named individuals advocating for change in start times. Therefore, based on the information given, we cannot determine who among Hina Talib and Shelby Harris advocates for this particular change in school policy.