R. David Valle's Ramdu in Sefer Halekutim vol 1 says that in secret this particular member of the Pantera family was certainly Moshiakh ben Yosef even if he was a Mamzer because, a mamzer is like a Talmid Chacham, who takes precedence over an ignorant Kohen Gadol. Nevertheless, since Sinat Chinam (baseless hatred) was in Israel at his time, he was destroyed and crucified by HaSatan.
According to the Ramdu, Rebbe Yehoshua Minatzrat became central to the the blessing given to Esav in Beresheit 27:4 symbolizing the Israel which is worshipped by Esav (Rome).