Well there's no line up... Sounds like a firing squad,f.Channell wrote: Sounds like the system used in Iaido.
What if an "older brother" comes back after 5-10 years? How would you know how to line up not knowing him?

Traditional CMA of this kind are run like a family.. Like you are home with your family except you are training.. Compared to karate it's very unstructured most of the time.. Students work with each other and are often left to decide what to work on themselves. The older brothers are supposed to lead, teacher level folks will assist, but each student is at his own level.
The young students will often mistake a returning older brother for a new student but the more experienced students will know, almost right away--you can tell if you listen and watch closely, how they act and of course how they perform--if working with an older brother you'll know right off. And at some point a returning student would be introduced to the newer students..