“rambam seems to say [as far as i remember] close before mashiach nevuah will return .” i already quoted it, he says Rambam igeres taiman:
“According to the interpretation of this chronology, prophecy would be restored to Israel in the year 4976 after the creation of the world” ולפי ההקש הזה והפירוש הזה תחזור הנבואה לישראל בשנת ארבעה אלפים תתקע”ו ליצירה
i dont have page numbers but you can search the above words in sefaria in igeres taimon
Maybe Rabbi Cumin was exaggerating when he said the Rebbe runs the world. i agree 100% (we went thru this already medrash gemarah that says yaakov is g-d)