This Maamar that deals mostly with the idea of Moshe’s 515 prayers (VaEscahnan) to go into Eretz Yisrael, also deals with the idea of 15 of Menachem, as well as the haftora, Nachamu Nachamu Ami. The prayer is above Hishtalshelus, and asks for something beyond deserved but still from the Chain that is unique to…

נחמו is said twice for the two בתי מקדש, though the first one was greater and should include whatever they lost in the second one; but the second one’s ירידה is greater and the נחמה is for the ירידה and the ultimate עלי’ה that will follow based on the principle that what falls lower rises…