Originally Posted by DarthParametric
Precisely because of what I said in the previous post - it's Shepard's story. You can't have some random guy on equal footing suddenly turning up in the 3rd act and start throwing their 2c in.
Shep can't be everywhere at once and there are plenty of people just as capable doing their own things parallel to him. Just because you don't see them doesn't mean they don't exist... and just because you may happen to control that person in a side story event doesn't mean what they're doing is as equally grand as what Shep gets up to.
A side story is a side story not a main story... that's why they're called "side stories"... at least that's what I was told.