@AngolFear The opinion I expressed about a leak having a negative response on the Dark Energy theme was taken from this article http://www.ign.com/b...nding-spoilers/
I don't know how you can deny that Dark Energy is a theme that was designed into the MEU from the start. Most of the essential creative devices needed to make the fictional world work are related to Dark Energy. From the enigmatic material called EEZO; through how it interfaces with organics (Biotics) and how it is the essential techno space magic that enables the Interstellar world of the MEU work around known physical laws (FTL drives and Mass Relays). All that creative work suggests that Dark Energy would have some form of massive influence on the plot resolution (And it did. The Crucible was a Dark Energy manipulation device of immense power)
In ME1 we are introduced to the Reapers and informed that their motivations etc are "beyond comprehension" to limited organic minds and how they exist in a time frame that is so far removed from an organics. We also discover that the Reapers use a cycle of annihilation of all advanced lifeforms and that their relay network and citadel are an elaborate web of Dark Energy powered nodes that defy the effects of gravity and time dilation.
Then in Mass Effect 2 the Dark Energy theme took on even more significance and appeared in the forefront of a story thread. Here it was being linked into some enigmatic, but ultraviolent effect on the life cycle of a star in a manner that was challenging the understanding of 2 species: the Quarians And the Geth
Then finally in ME3 its appears in the form of the Crucible and the waves of energy that spewed out of the containment fields in the Mass Relays. Dark energy Particles (EEZO) previously contained within the Relay network explode outwards across the entire Milky Way
I've included the source notes for how Drew Karpyshyn interviews about the Dark Energy theme play out. Looking at your own source, the author interestingly questioned the claim that the thread wasn't "fully fleshed out"
"Despite describing the plot thread as "something that wasn't super fleshed out", Karpyshyn was still able to give gaming radio show VGS a detailed summary of how the storyline might have developed"
"Dark Energy was something that only organics could access because of various techno-science magic reasons we hadn't decided on yet. Maybe using this Dark Energy was having a ripple effect on the space-time continuum.
"Maybe the Reapers kept wiping out organic life because organics keep evolving to the state where they would use biotics and dark energy and that caused an entropic effect that would hasten the end of the universe. Being immortal beings, that's something they wouldn't want to see.
"Then we thought, let's take it to the next level. Maybe the Reapers are looking at a way to stop this. Maybe there's an inevitable descent into the opposite of the Big Bang (the Big Crunch) and the Reapers realise that the only way they can stop it is by using biotics, but since they can't use biotics they have to keep rebuilding society - as they try and find the perfect group to use biotics for this purpose. The asari were close but they weren't quite right, the Protheans were close as well."
An earlier interview with Drew Karpashyn in March 2012 adds more "fleshing out detail" http://www.gamewatch...ffect-3-endings
Dark Energy was a force that was going to consume everything. According to Karpyshyn, "The Reapers as a whole were 'nations' of people who had fused together in the most horrific way possible to help find a way to stop the spread of the Dark Energy. The real reason for the Human Reaper was supposed to be the Reapers saving throw because they had run out of time. Humanity in Mass Effect is supposedly unique because of its genetic diversity and represented the universe's best chance at stopping Dark Energy's spread."
The original choice was between killing the Reapers and trying to find a way to stop the Dark Energy threat with what little time was left before it consumed the galaxy, or, "Sacrifice humanity, allowing them to be horrifically processed in hopes that the end result will justify the means."
And the link I used as a source offers even more detail on the DE ending theme
Before we were given the synthetic uprising destruction as being the purpose of the reapers, Drew Karpyshyn (Former Bioware story writer) stated that the reaper's original purpose was to harvest organic and synthetic life in order to find a way to stop dark energy from destroying the universe. Mass effect contains dark energy however it was the reapers gift to life. Sounds strange although it was most likely used to guide species towards their eventual extinction as well as easy passage for the reapers to move around the galaxy.
As humanity is a very diverse species, the ending choices would have been two very different options.
1. Simply destroy the reapers as you have throughout the entire series and put your faith in the rest of the other species to find a way with what little time you have left. Maybe about 200 years until dark energy starts to destroy the universe. My guess is if you have a high enough EMS then the species would have found a solution to this dark energy threat due to the amount of scientists and technology. If you had a low enough EMS level, then the dark energy threat looks problematic and most likely can't be solved leaving foreshadowing over what will happen to the universe.
2. Let the reapers harvest humanity so they can figure out a solution. However its unknown what would happen to the other species or the extinction cycles. I assume that if you have a low EMS, the reapers will harvest all life in the galaxy as humans are not enough to figure out a solution to the problem but have found a way to solve the problem after the current cycle and if you had a high EMS then the tech combined with the reapers harvest figures out a solution. To start all this off, Commander Shepard would have to be harvested himself in one of the pods similar to the ones in the Collector base
The thing I find most impressive about the Dark Energy theme is that Bioware actually pre-empted the science community's acceptance of the idea and their visualization of Dark Energy is excellent. The discovery of Dark Energy and its role in accelerating the expansion rate of the Galaxy was recognized in 2011 by the award of the Noble Prize for Physics. The press release makes mention of how revolutionary the ideas are http://www.nobelpriz...2011/press.html
The motivation applied to the Reaper's seeking a way of controlling the impact of Dark Energy in the MEU ties in with our own new understanding of Dark Energy's role in our own universe. The acceptance of the theory of Dark Energy and its effect on the acceleration of the expansion of the Universe and its implications that acceleration will have on the capacity for the Milky Way galaxy to support and its eventual decay into heat death in the lifetime of a Reaper appear to be the sort of motivation for the construction of all the elements in the cycle.