Answer: Non-sanctioned
Explanation: Non-sanctioned leadership is often referred to as influence made or exerted on an organization outside the formal structure of the establishment. These means that Non-sanctioned leadership could be viewed as the ability to impact with being expressly authorized or permitted to play or serve a lead or leadership role.
In the scenario above, Sharla was just being regarded as the leader of the team without being any authoritative or formal permission from the company or having served more years in the company. This may be due to his ethical perception or other factors.