And if cunin and chabad use the terms rebbe and god interchangeably, whatever reason you’re going to give for that, i think it speaks for itself…
Not every word that a tzadik says is nevuah; not every word that even a navi says is nevuah! Only when he speaks for Hashem; this is why Moshe was able to make a mistake, on his level, when he said shinu nah hamorim; that was him talking, not Hashem, no matter how batul to Hashem Moshe was(and he was the most batul because he was the biggest anav)