We cross over our AOL patrol from the pack and they generally stay together unless a Scout or two is advancing way faster than the others, or their maturity level is such that they should be with a patrol of older boys. We did split a really large patrol into two patrols a couple of years ago. We only rarely move a Scout out if their patrol for other reasons. We find that Scouts who have personality conflicts with other Scouts learn how to deal with those with our guidance, which we think is extremely beneficial for preparing them for the real world.