Finishing the מאמר, the רבי explains the connection between חנוכה and סוכות, specifically the 70 bulls of the קרבן מוסף:

With חנוכה being the celebration of יחידה, we see how יחידה is used, not only as a defense against darkness, but as the key for transforming the darkness, which is also the idea of the 70 bulls, corresponding to the 70 nations.