I am all for diving freedom. If the capt and DM said it is ok to do your own dive, but don't stray too far from the group, cool. But I don't agree on letting divers w/o a flag, totally loose on a drift dive with them paying no regard at all to where others are.
What happens on a wall dive ? Dive starts over the sand. Some will stay over the sand, some may head out to the wall, some may head inland, a photographer might anchor themselves and move 1/4 the distance, etc.. Some may stay down for 45 minutes, others 60 minutes ? Multiple dive boats on the same site ?
There are dive ops on Coz that do this regularly ? If so, I imagine all divers are required to have an smb, reel and shoot it when on their safety stop.