Relying on someone else for your survival is a good way to get killed in any dive environment.....deco is not necessary
I really fail to see the YOUR GONNA DIE difference between three people all having the same acesnt plan on their slates, all coming up together, and all three of them looking at their own slate each, vs. the exact same thing with two of them keeping their slates in their pockets until/unless needed and all looking at only one slate. But that's just me.