On Kabbalah and Harmonism

I was talking about a student of Rabbi Levi Nachmani, because he wrote about him (Rav Nachmani) that he would tell his students after they finished the Ramchal to study the Gra, and he himself would express himself that Chabad is the Einstein of Kabbalah. So I called him and we talked about the subject of methods in Kabbalah, and he ultimately said that every method is 100% right in itself, but every method is a different examination, and therefore no one is truly 100% right in its truth. Is this what you mean by the harmonious approach? Also, do you think that in Kabbalah too there is a legitimate error and that in the end only one person was right?