The Ushpizin in Kabbalah

The other-world Ushpizin guests are: Avraham, Yitzchak, Yaakov, Moshe, Aharon, David and Yosef HaTzaddik. Yosef is not mentioned specifically in the Zohar - as opposed to Miriam, the sister of Moshe and Aharon - and so we should ask: Why was Yosef, of all our many righteous forebears, chosen as one of the guests? (We will also relate below to why Miriam is not included in our Ushpizin.)