Usually the best indication of an excellent leader is the musicality and the dynamics of his dancing.
The amazing leaders are not necessarily the most popular or attractive ones, but they definitely have body movement that is innerly aesthetic, coordinated and looks very comfortable. Excellent leaders are simply beautiful to look at.
They exhibit a lot of spiral movement in their bodies. They use turns and twists often in their dancing. Turning for them comes naturally and it is dynamically intertwined with the music. Oppose this to certain other leaders who look at turns as a memorised sequence of steps that needs to be executed until the end with no melodic or rhythmical variations.
Excellent leaders usually make eye contact with the leaders that surround them on the dancefloor, keeping a collective effort for a safe and comfortable ronda for all couples in the room. Of course they possess excellent navigational skills and do their best to keep the follower in their embrace safe in her surrender.
It is obvious that an amazing leader dances with and for his partner, not for the audience.
Yet an ultimate proof of a great leader is the look of utter delight on his follower's face.
I'm Hannah A. Tomšič from Ljubljana, Slovenia. I'm in love with both leading and following in tango. It is wonderful to explore tango indefinitely and to help others learn. Please, join my quest. Ask a question, tell me your story, make me see another perspective. We are all here to learn from each other.