Background: The Gerontological Nursing Competencies (GNC) Program is a national workforce initiative designed to strengthen capability and leadership among new gerontological nurses. Its structured mentoring model pairs learners with experienced nurses who contextualise learning, share practice wisdom, and support capability development. Although traditionally centred on learner outcomes, emerging feedback reveals an unanticipated effect: the mentoring role opens space for experienced gerontological nurses to re-examine familiar practices and underlying assumptions, highlighting an incidental yet powerful opportunity for workforce change. Positioned at the intersection of program design, mentor support, and system implementation, the Mentor Coordinator occupies a rare vantage point in workforce research, offering insight into mentoring as an educational strategy and a driver of cultural and structural change. Aim: To examine the evolution and impact of the GNC Mentoring Program through an autoethnographic case study, exploring how coordinated mentoring, reflective leadership, and iterative program design contribute to capability uplift across the gerontological workforce. Method: Over 12-months, the study draws upon the Mentor Coordinator’s reflections, field notes, and observations, supported by mentor feedback, workshops, discussion board contributions, and engagement analytics. A thematic analysis connects personal experience to system level dynamics, highlighting pressures, inflection points, and opportunities for innovation in the mentoring and gerontological workforce. Results: Preliminary findings suggest this reflective recalibration influences how mentors understand and enact their clinical practice, leadership behaviours, and engagement with gerontological care, underscoring an incidental and significant element of workforce transformation. Conclusion: This study highlights the reciprocal impact of mentoring and contributes to sector wide discussions on innovative, sustainable approaches to strengthening the aged care workforce.