Ignis Mors wrote...
Something along those lines, because we don't know how long Leviathans live, it could be the case. And, the keepers do keep much of the Citadel a secret. So, it could be that there's a Leviathan that is Catalysted hidden near the core of the Citadel. And that, somehow, it hasn't gotten old and died. Maybe Leviathan tech has it in a state of physical cryo, while its mind is still Catalysted. And, the Catalyst is crazy, because the reapers are a lot like the geth, so it's been hearing the reapers talking for billions of years.
I like it, I'm not sure if you've ever played Fallout: New Vegas. But there's a character in that called Mr. House who had been kept alive for hundreds of years via something similar.
It could work the same way. I like it! It would make a great dlc, and then when the crucible docks at the end. No starchild! XD
But I do think that would drastically change the ending instead of just adding an alternative.
AchesOfDoom wrote...
I come to realise something.
The endings of ME3 can be intepreted like this:
Let's say you are an assassin that needs to kill someone important but you don't want to alert the police of your doing, and to consider the hit as a mere coincidence. You will want to shoot at least two other people in the open and all will assume that this was a hit that was intiated by some maniac that likes killing. ( To be sure that no ones will ever came out with an explanation, the first kill needs to be a civilian that has nothing to do with your target ). Who will ever think that behind this you wanted specfically kill a target? So comparing this to the endings, we can assume that the endings are not what they look like. At least we can't say for sure as long as Bioware will release new content. Think of this: EC was 1.9 gb....Can you swear on the Bible ( figurative speech ) that some pictures and probably 3-4 minutes of cut scenes are occupying that much space? 
That's the funniest analogy I've heard lol. But it makes sense.
Unfortunately, people have mined the EC to jippy and back, the only thing they found was Leviathan files.
So, in that sense, you are right, there was more than just the EC content. But I don't think there's nothing we don't already know about now.