At first I was going to post this thread about preserving the buddy system. It seems to me that whenever a diver posts a thread with either questions about the buddy system or more commonly a bad experience with a buddy and what to do we can't get through the first page without somebody posting that you are always a solo diver and should dive solo. Why?
That could interpreted a number of ways. I'll try to address them.
1.) That you should dive solo. I don't get that from the solo discussions. It is often put out there as an option some people find workable and preferable, and so it's offered up as an option. Just as changing buddies, getting more training, practicing buddy skills, DIR training, etc..., may get offered. Solo is not the preferred answer for everyone, but it's a fine answer for some, and worth putting on the table for consideration.
2.) That you should not be so dependent on the buddy system (as it is not perfect & thus not perfectly reliable) that in the event of a separation you will panic or otherwise prove dangerously inadequate. The issue of weighing independence vs. interdependence gets hashed out here & there, and views differ, but a sense of having primary responsibility for yourself and the mindfulness it inspires is not a bad thing.
3.) That you should be 'solo capable' before you dive at all. And preferably solo equipped even when buddy diving. In my view, this is overkill.
From the fatality stat.s you mentioned, one might infer that buddy separation can kill, and one ought to be ready to handle an impromptu solo situation should it arise unexpectedly.
Richard.