PMP Practice: Determine and bestow level(s) of decision-making authority

Kai Hernandez-Osei is managing a spacecraft instrumentation project for Tariq Mansour-Haddad Technologies. The critical sensor calibration phase requires highly specialized technical decisions about tolerance thresholds that will affect mission success. Thiago Santos, the senior instrumentation lead with 12 years of aerospace experience, has successfully delivered similar calibrations on three previous missions. However, two months ago, Thiago made a minor documentation error that required rework, costing the project two days. The sponsor has expressed high confidence in Thiago's technical judgment. The project is currently on schedule, and Thiago has requested full decision-making authority for all calibration parameters within the approved design specifications. Which approach would be MOST effective for Kai?