While everyone knows that Rabbeinu's Histalkus was on the 4th day of Succos, which is the day of Moshe Rabbeinu of the Ushpizin, he was in fact buried the next day - the 5th day of Succos which is the day of Aharon HaCohen.
Before Rabbeinu's last Rosh Hashana of his life, the only one that he spent in Uman, as per his insistence on all of his followers being together with him for Rosh Hashana, he took exception with two of his followers who explained to him beforehand that they would not be able to make it for RH - a Jew named Moshe, and Rav Aharon, the Rav of Breslov, for whom it wasn't a long distance traveling to Rabbeinu when he used to live in Breslov. As Rabbeinu put it "Moshe and Aharon won't be here with me for Rosh Hashana".
It seems that with his statement, Rabbeinu predicted when he would pass away and be buried which both happened in Uman. It would be a mere few weeks later when he passed away on the day that we celebrate the Ushpiz - Moshe Rabbeinu and was buried the following day when we celebrate the Ushpiz - Aharon HaCohen.
What is especially significant of mentioning the above this year is that this is the 202th Yahrzeit of Rabbeinu, and the word Rav spells the Hebrew number 202. In term of the Rav of Breslov, not only was Rav Aharon not opposed to the Chasidic movement or Breslov, but he himself became a follower of Rabbeinu, even as he had his rabbinical duties as the Rav of the town, which was among his reasons why he felt it wasn't possible for him to travel to Uman to be with Rabbeinu for Rosh Hashana which turned out to be the last RH of Rabbeinu's life in this world. This was in stark contrast to other rabbis of his day who were the Rav in their respective towns in which there was a Chasidic leader who not only were not followers of the relatively new Chasidic movement, but felt their rabbinical position threatened and at times took action against the Chasidim.
It seems that another Remez to the timing of Rabbeinu's passing and burial in relationship to Moshe Rabbeinu and Aharon HaCohen is hinted in the last verse of the 6th psalm of the Tikkkun HaKelalali - Tehillim Perek 77 - Nochiso Chatzon Amecho B'Yad Moshe V'Aharon "You led your nation like flock by the hand of Moshe and Aharon". Moreover, this Posuk, like Rabbeinu's name, begins and ends with the letter Noon (perhaps this was Rabbeinu's Posuk for his name that he recited in Shemoneh Esrei).
In terms with the name Aharon, we see that Rabbeinu's title Moharan ends with the exact order of the last three letters as Aharon's name - Hei, Reish, Noon (Sophis). Perhaps this hints to Rav Aharon, who was the Rav of the town that would name Rabbeinu's Chasidic movement, as he himself was a follower of Rabbeinu, pushing aside his own Kavod to be a follower of a Rebbe, which was to say the least not a very popular thing to do in those times, amidst a time when Misnagdim were literally that, taking a chance that he could be fired from his rabbinical post. Indeed, he was also a follower of his namesake - the original Aharon - who pushed aside his own Kavod to make peace between his fellow Jews, and his reward was that he became the first Cohen Gadol, for only one who not only had such Ahavas Yisroel, but also helped promote it among other Jews was worthy of such a position in serving Hashem, representing the entire Jewish people with his prayers and Sanctuary offerings. And along these lines, the Gematria of the names Aharon and Nachman together is 404, which is twice the number 202=RAV.
In fact, both Rabbeinu and Aharon HaCohen are especially related to Succos. Well, first as far as Aharon is concerned, it was in his Zechus that Bnei Yisroel had the Anenei HaKavod protecting them for 40 years in the Midbar. And according to one of the rabbinical opinions as to why we live in Succos during this holiday, it is in commeration of the Anenei HaKavod that Hashem used to protect Bnei Yisroel with, and hence we show both our appreciation and our recognition of Hashem treating us with kindness. And then for Rabbeinu, the word HaSuccos - which is both referring to the holiday (as Chag HaSuccos) and the Succos in which we reside in during the seven day holiday - is the Gematria of Na Nach Nach Nachman Meuman - 491!