The game is probably designed for 3 players, not 4. That's not downgrading, that's just how they are making it. Look at Halo for instance. They didn't make a "mistake" by making it 2 player co-op, they built it intentionally. They didn't say "Halo 5, now with 4 PLAYERS!. Halo 6 now with 8 PLAYER co-op! Halo 8, now improved with 12 PLAYER co-op!"
Please i'm hoping for official confirmation that Dead Island 2 will support co-op "crossplay" (ie. PC + Playstation + Xbox, all playing together co-op,
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