So if you go with groups , Question 1 who is in the faster group? Question 2 Which group goes first , Question 3 How do you move from group 1 to 2 and finally Question 4 Who decides who’s in which, and based on what criteria?
Why not just hammer it along the West Ferry and see who’s left standing, that usually splits the group, then hammer it into and out of Kilmalcolm that would split it , popularity brings additional problems