I see this thread is still ongoing...

We are " ALL " solo divers... Unless you are a true dive team.... Then you are never out of arm's length of a team member... The buddy system gives a false sense of safety that's really not there.... IMHO.... As I've said before, I wouldn't buddy dive with most divers I've seen... Not even in a kiddie pool....
You best be ready to save your own ass....
Jim...
Nah ... there's some misconceptions there. We are most certainly not ALL solo divers ... I know many people who are committed to diving as a team that are anything but solo diving.
I think it more accurate to say you've never dived with anyone like that ... or at least you've never given yourself the chance to make that commitment. But they're out there ... functioning quite well as a team. And diving with those people can be pure joy when you're on the same page.
I love to solo dive. I also love diving with a whole bunch of people who I trust without hesitation would be right on top of it if I never needed them to pull me out of a bad situation. Several of those people are former students ... so I know
exactly what they're capable of ... there's no false sense of safety at all when we dive together.
Buddy diving involves a commitment to the concept of
our dive rather than
my dive. If you have any hesitation making that commitment, then you are not really buddy diving ... although you may be in the water in the proximity of another diver. If that's you, then certainly you should be prepared for some self-sufficiency .. because that style of diving feeds a sense of independence that defeats the whole point of a buddy.
Diving is very habitual ... we develop and rely on behaviors based on how we dive and how we look at diving. I find that the more I solo dive, the harder it becomes for me to make that mental commitment, and to rely on learned behaviors to be a part of a team. It's one potential "gotchya" you need to be aware of if you want to dive solo ... you'll develop habits that are not conducive to diving with other divers. Making a mental commitment to one or the other style of diving is much easier than developing habits that work well for both. It can be done ... but it's not as simple as flipping a mental "switch".
If you're not prepared to make the commitment to developing good habits as a dive buddy, then yes ... you'd best be ready to save your own ass. Because team diving involves a two-way relationship that won't work if only one of the divers is ready to make the commitment. And in that case, no matter how close you are to each other, you're diving alone ...
... Bob (Grateful Diver)