why virtual waves help

yeah, but the bigger gaps also mean that there is less reason to assume that is how they really move...  I supose the reason for using virtual waves would be something like:

There are several things that affect their movement profile (which are the things I want to segment on)
If virtuality affects their movement profile, I should segment on it.  If it doesn't I should use virtual waves!

But I am wondering whether one could in theory make a random movement that is simpler than wavesurfing and would not be any easier to hit than it would be with a gun that only uses firing waves.  As I see it, the assumption behind virtual waves is that if I fired now, they would move in the same way that they are moving for the 2 or 3 incoming bullets.  I am wondering if that assumption is neccessarily correct (with a certain margin of error) for any reasonable random movement.  (I think there really could be random movements more complicated than wave surfing, in fact I was planning one, but when I realized that wavesurfing was simpler I gave up)