User blog comment:Alpha1ance/Promises from an old article/@comment-5038903-20120607140234/@comment-4950455-20120608215654

But on the other hand, you should be able to revise that ending to fit with changes to the story or themes that might have happened in the meantime. Using your Harry Potter example, for instance, the last word of the last chapter was originally said to be "scar". It wasn't, so clearly some changes were made along the way.

Now, we know the ending of ME3 was changed from the original "dark energy" plan. But if so, then this process should have held in reverse - the rest of the story, or at least what hasn't been released so far, should have had these changes incorporated into it. They weren't.