Focus on all your teams, put in a good culture that makes most players want to stay. A lot of Div 2 clubs are no longer losing all the best players every year under this new model and are strengthing, look at how Charlestown, Southy and Kahibah are now going. Other clubs showing strong improvement and getting stronger.
And where do the 13s start?As for how it would work for the next year, simple, lower team in each grade is relegated, other promoted into their place...it's not hard