A “visionary” is s thing created in the minds of the people who follow a leader.
Really what you are saying is “show me other people are saying you are a visionary” and I’ll work with you. Was Galileo a visionary? The church didn’t seem to think so.
The problem is that “other people” are often wrong so why reason based on their perception.
You should get on board with a project because your beliefs align with the world that the leader sees. Not because other people say the leader is a “visionary”.