The unity of Moshiach ben Yosef and Moshiach ben David is a reflection of the unity of Zeir Anpin and Malchut, represented by Ez Meshuleshet and Ayil Meshulash.
In the divine context, Ayil Meshulash has the original content, the count to 288, representing Zeir Anpin inside Malchut, from the point of view of our reality. This is the Tikkun of Ramchal.
On Earth, the count to 288, and subsequent death, is replaced by the count of the GR"A, and by Petira in 5852. Such is the Chibbur, at the beginning, between Heaven and Earth. קימעא קימעא.
