I agree wholeheartedly. The Golden rule is to assure the rider behind you knows there is a turn onto a different road or trail by waiting for that rider at the turn.
The Silver rule is to tell the ride leader or sweeper if you are leaving your group. This is very important because we and perhaps the group will go looking for anyone who is missing. We will not be happy if we learn later you left us after we spent the day searching for you, thinking you had a mechanical, got lost or got injured.
My favorite ride is the one I'm about to start!
'06 Husky TE 610, '07 Triumph Tiger 1050, '93 ATK 605