Google “I am the soul of Rebbi Nachman” and you’ll see what I’m talking about. I’ve seen the reference elsewhere too, but I don’t remember where. It’s unclear what he meant by it.
In a recent English biography of Rav Kook, it describes letters between Rav Kook and Rav Tzvi Yehudah in which the latter talked of his desire to become a full-fledged Breslover, but his father discouraged him, advising him to be more like himself–influenced by chassidus and various other sources instead of being a follower of a single individual.
Many dati leumi people today are strongly influenced by Breslov (as in the Chavakuk movement (Chabad-Breslov-Kook)), so even today there are many followers of Rav Kook who go to Uman.