Oh, I wanted to post this the other day. In one of the very first cutescenes, where you are about to join blade, Elma says something along the lines of "I wonder what would have happened If I wasn't there" when talking about earth attack and destruction. One other character says that he doesnt know, but he knows is because of her that they got away.
I have the feeling that this is the kind of cutscene that only makes sense when you finish the game, like the one in the original Xenoblade were Shulk says that there are 2 versions of him in his head.