"Could it be a contributing factor though? For example, if a diver sustains an injuyr on a dive and is unable to swim back (to shore, out of the cave etc) and a buddy could have pulled him out?"
I don't think many of us cave dive solo though I imagine there are condtions that warrant it. What kinda injury anyway? If some one has a heart attack or some other severe injury deep in a cave I don't think a buddy is going to be able to solve that--CPR in a cave--nope. What injury, this is all antedotal and what if. What if anything?
What if both the buddies are injured? What if the stronger buddy is "injured", why assume the other will be able to tow him/her anywhere.
I realize it is hard to get it past the years of antedotes and what ifs and old wife tales and my instructor said so and all that and finally realize that the buddy system is not some panacea of safety and that for every what if without a buddy there is a what if with one. N