The statements are obviously false when the plane goes downwind during exit. So it assumes, the plane goes upwind during exit, but there are more options. I would be happy if Brian could comment on these two: 1. Wouldn't it be preferable if the plane goes upwind in a 45° degree angle, so that people can't be blown atop of each other? The plane should not cross directly over the drop zone, but across a point which lets the groups open in the desired spots. 2. If you go directly upwind, you assume that the exit seperation is a fixed time span. Wouldn't it make more sense to let the free flyers go out first (but earlier than the first bellys would exit), then take a very long pause then send the belly flyers out? Sure, you have to convince the belly flyers that they will open at the same spot as before (which would be a hard task), but with this way you get horizontal as well as vertical seperation between free flyers and belly flyers. Stay safe!