Under which keyword would you try to find out more about the grouping behaviour which looks like this? Does anybody recognizes such behaviour, or know an animal species which uses it?
My tries: threshold group behaviour (threshold here is the group size - if bigger than 5 individuals == stable), or gravitational group behaviour?
After step 6 the group disintegrates (for example due to foraging) and mechanism starts by step 1. Important thing is that the location of forming stable group is always different.