http://forum.bioware...3#entry20127469
I made a post in Revan's post from March this year, "is Ryder actually the antagonist". Although we got the protagonist/antagonist the wrong way around, I pretty much 100% predicted the plot device back then, just based the N7 day 2015 trailer alone. Quote below:
One idea I like about the protagonist / antagonist, is that its a 'greater good' moral scenario. I'm really not a fan of bond type supervillians who want to see the world burn, I like the grey moral issues - and being that the operative is N7 or ex-N7, this seems likely.
I'll paint my picture of Ryder being the antagonist - starting with backstory.
- Ark is even bigger than it seems, the screenshot you see of it looking like the Citadel is because it houses like 100,000 people, say 20,000 humans and a mix of other races.
- They left during the reaper war, and although we dont KNOW the canon ending, we assume the worst, this might be whats left of the humans and other races. [Alternatively, it might just be unfeasible to return, so you need to find a home to simply survive].
- Therefore, its as much about exploration as it is about survival and protection of your people. As an N7 operative you are finding a new home for your people.
- You go on missions with a smaller vessel like you had in ME, this is your operating base/ship as per normal, but you can travel back to your people on the Ark, similar to the Citadel.
So with this in mind, imagine now that there might be different moral compasses from the N7 team about how to approach finding a new home for humans in Andromeda. Some would want to play nice, and keep our morals at any cost, others might vote to sacrifice these values for the survival of our species.
So, my view of Ryder being the antagonist might be something like:
- The values/directives of the council are hyper diplomatic, despite overwhelming hostility from the Helios Cluster in Andromeda, the rules are to play nice at all costs to fit in.
- We discover the Remnant precursor race somehow and discover mastering their technology could give us power over andromeda
- There is a rift in the humans and N7 specifically, and Ryder breaks off with a bunch of them in order to try and find this technology so they can claim the technology and therefore cement the home for the 100,000 refugees by technological prowess.
- The protagonist forms a party to stop Ryder and the rogue N7 cell from destroying their chances of assimilation into Andromeda through their reckless pursuit of this Remnant tech.
- Perhaps as the protagonist, after seeing the logic of the antagonist, you could choose to side with the rogue N7 agent and go renegade, or go paragon and stop them in the end for the greater good.
- As we know, side stories in the game are about ultimately deciding the fate of the warring factions in Andromeda using the Remnant tech.... so why not our own fate?
FeelsGoodMan about being the first on the forum to predict the N7 vs other human rift 
The one part that the OP forgot to mention is the integration with the Survey leak (which is now 100% confirmed through how many predictions it got right). So, we know about the precursor race and so called 'remanent tech'.
This technological advantage is obviously going to be the point of conflict in the galaxy and this ensuing power struggle is obviously going to be the general human vs N7 humans rift. The way I see it, there is a war already raging in the helious cluster (as the races start to ascend their technological ability through using remanent tech), and you can pick a side, or perhaps even use the power for the good of humans alone.
The thing I got wrong was mixing up the antagonist/protagonist names, but it seems like this plot device is right on point. I really like this for a new trilogy because it means the first game can be about exploration and largely close with an internal conflict alone, and then you can get into the big fish and some sort of greater existential threat in ME5/6. Starting with this story allows the game room to grow.