I would say that if you ever find yourself in this diving scenario to be especially careful and visually time your entry with the other divers instead of relying on everyone to go exactly with a count.
I feel lucky to have survived 2 collisions involving divers in scuba gear in the Philippines. Luckily, they landed on my chest and legs and not my head.
When entering by a backroll from a boat (90% of my dives are done this way) instead of popping up to the surface immediately, as most divers do because their BC is inflated, do two fin-kicks while on your back and about three feet underwater.
You will then allow adequate space for any following diver(s), and also get clear of the boat.
A trick I learned the hard way, years ago. Has stood to me since.
BTW the posting is a good one. Any post that increases awareness of water safety can do only good.
Heartfelt condolences to the family.
Seadeuce