If I find some DFs to ride with on the flats, I'll turn myself inside out to keep in contact on climbs, then feather my brakes on descents. Alternatively if they choose to match me, they'll loaf on climbs and work like dogs descending. On a Brevet, virtually every time, somebody will crack and we go our separate ways. Unless theres some motivation to stay together, like a fleche or for safety, that's just how it is.