We're actually spread out pretty far by then (plane's going quite fast...depending on what plane it is, went A LOT faster in the C-5). Each DZ was a few miles in length. Yes; how you exit determines quite a bit. If you watch the guy who stepped out and spun a bit, you'll see his chute opened just a slight bit later than most others. Happened to me once while on a night jump...but it took a few seconds longer than that to open...
NOT fun. The opening shock is about the same, no matter your position coming out of the door; though it definitely varies with plane type. The C-5 jump was like having 2 opening shocks at once!
You'll also notice that there are paratroopers jumping out on both sides of the rear of the plane. The jumpmasters try to alternate their exits, to keep them from "bumping" into each other (happened to me once; you just have to slip away). Also; in the first sequence, just below the static lines, you'll barely see a green light that turns red after they're all out. That light is what tells the jumpmasters when it is a go. It's turned on and off by the AirForce crew. It could also be turned on if there's issues on the ground or air, etc. We had jumps scratched (cancelled) due to various issues; such as lightning (we have clearance to jump in the rain though), high winds, plane malfunctions, etc. We even had one cancelled because there was artillery flying over the DZ! You'd think they would have coordinated that. That would have been an interesting jump! lol
Just as I'm sure Brian is proud of his 101st brethren; I'm proud of what my brothers and sisters in the 82nd do everyday....all the way.
-Keith