Just dive and enjoy it. Don't put yourself in a position to trail the group and supervise. Stick with your buddy and enjoy the dive. Let the boat crew do their job (or not) and just make your dive. Help someone, of course, if they need it, just like any other good diver would....but don't make the focus of your dive the "divers". Just because you're a DM does not mean that you are responsible for the group. That'd be like saying, even though my ENT was diving with me, since I burst an eardrum it's his fault....sorta...ya know? As long as you're not working for the crew or functioning in a leadership role, you have no responsibility to supervise the group. If an incident happens, you probably will be held to higher standards due to Duty of Care, but not to the level expected of the crew or DM's leading the dive.
When we go to Coz....if one of the group is doing, say, AWARE Fish ID on one of the dives, then one of our Instructors is now conducting a training dive and is fully responsible for this student, no matter the relationship with the boat crew or DM's....and on the very next dive 2 hours later, the situation may totally change because the student is done with the specialty and now the Instructor is on a pleasure dive. BUT, I'm now functioning as a DM because a couple paid me to lead them around the outside of the C53 and show them stuff.....on the next dive they're on their own and so am I.....see?
BTW - Nice triple black vert......I just sold my mag red 6sp....thinking of a new Z06 this spring....maybe....drooling over that LS7....