I agree with the OP....I highly doubt they would put Coop into the game, and it sounds more like just another way to advance the story. Perhaps they try and tell the story of one character while you play on the other, or maybe tell two characters' stories at once (which seems a little difficult, but doable I guess). All in all I think if there were going to be Coop it would be announced differently than just "at points there will be split-screen"
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