How Many Mashiahs Are There?

Bamidbar Rabba 14:2 starts out (paraphrased):

On the verse לִי גִלְעָד, וְלִי מְנַשֶּׁה, וְאֶפְרַיִם, מָעוֹז רֹאשִׁי; יְהוּדָה, מְחֹקְקִי (Gilead is mine, and Manasseh is mine; Ephraim also is the defence of my head; Judah is my sceptre) Since there's a Mahloket about how many Mashiahs there are - some say that there are 7 since it says "7 shepards" and some say 8 since it says "8 princes of men". But there are really only 4, as it says "And Hashem showed me 4 craftsmen"....These four craftsmen - David Hamelech came to specify who they are. לי גלעד refers to Eliyahu who came from the inhabitants of Gil'ad [from the tribe of Binyamin], לי מנשה refers to the-Mashiah-that-will-come-from-Menashe as it says לִפְנֵי אֶפְרַיִם, וּבִנְיָמִן וּמְנַשֶּׁה--עוֹרְרָה אֶת-גְּבוּרָתֶךָ; וּלְכָה לִישֻׁעָתָה לָּנוּ Before Ephraim and Benjamin and Manasseh, stir up Thy might, and come to save us. The ואפרים מעוז ראשי refers to the Mashu'ah Milhama who comes from Ephraim, as it says בְּכוֹר שׁוֹרוֹ הָדָר לוֹ His firstling bullock, majesty is his. יהודה מחוקקי refers to the "great redeemer", who comes from the descendants of David Hamelech....