@sledgefang Leviathan and Extended cut actually did a decent job of explaining all that.
However, Leviathan's new addition to the story (won't say in case someone cares about spoilers) does reveal a fairly obvious/predictable story path for the new ME.
I just hope that they set the game after the events of ME3, so we can at least get some clarification on what happened there (remember Indoctrination Theory?). This would be the one thing that could (somewhat) make up for that unsatisfying ending.
Probably won't happen, though. If I remember correctly, Casey was the one responsible for that mess of an end for ME3, and I'm guessing he'll want to keep it just the way it is.
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