Everyone at PillPack, the online pharmacy Amazon bought in June 2018, will report to Kabbani. CNBC sources claimed that Kabbani was instrumental to completing the PillPack deal, snapping it up in spite of Walmart's attempts to acquire the company.

Amazon has declined to comment.

This doesn't necessarily suggest that Amazon's fledgling pharmacy strategy is in trouble, particularly when PillPack's leadership is still around. They could handle the industry-specific obstacles while Kabbani addresses the top-level issues. However, the choice of leadership suggests that Amazon sees this more as a logistical concern than something that requires specialist experience.