User blog comment:SanjayBeast/Anyone else pissed about lack of Protheans in MP?/@comment-4835791-20120529215437/@comment-5503561-20120529224957

To keep the already straining, semi-plausible connection to SP alive.

Shepard goes on an N7 assignment to a MP map. -> MP players act as the Alliance team mentioned by Hackett, sent to keep said MP map "secure".