So if he had come up with his buddy he would be alive?Yet you do NOT know the cause of death.Hmmmmmmmmmmmm .Just lets go out on a limb here and say he had a massive heart attack as he was surfacing with his buddy,he would still be alive?
Regardless of what happened or how it turned out, his chances of being alive would have been better had he ascended with his buddy. There's simply no denying that much. When you are unable to help yourself for whatever reason, and you're alone,.........you really are gonna die. A buddy might make the difference.
StanS:Make sure you know your buddy and his equipment as well as you know your own
That's why having the same gear set-up is always the best policy, unless you're prone to forgetting your own set-up . <not that it had anything to do with this particular incident>