Why such a question you might ask? In one sense anyone can lead a kirtan, but let us consider a few things first. I write this as much for myself as others as I too am prone to egoism and a lack of proper attitude at times in my service.
There are few leaders, such as Indradyumna Swami and Sivarama Swami, who will only have capable devotees lead a kirtan, those who know how to keep a steady pace and stick to the same melody. I am not of the opinion that
anyone can lead at any given time, maybe