My favorite ( I was SDI Certified) is telling newbie’s to inflate their vests before they jumping in on all dives, then orient themselves to a landmark, coordinated with the other divers, give an okay signal then descend together. My first post-OWC dive was in 3-4 ocean foot waves where we had to vent all the air in our BCD’s before we dove in so, we didn’t bob around and get sick on the surface. I was like, "that’s not what they taught us in OW class." But, in the end, you go with the Diver Master.
Yes, diving with a really green diver is distracting because you need to keep an eye out for them. But, others kept an eye out on me so, I don’t mind returning the favor.