Yeah you got luck, he could have died.
Anyway, about the Vaseline, what I mean is that you tried for five days to get it to go back in. It did not go back in, so you cut him loose and let nature take it's course. Sometime later the tip dies and you had your friend cut it off for you. I'm sorry, but that is not a success story.
You are always telling people that you are to the point, blunt, or whatever, I am just being the same, so please try to see that I am not picking on you, I just have a different idea of what a successful treatment is. Successful to me means healed and no amputation in less than two weeks, not amputation. Amputation = Fail. Death = fail.
You got lucky because a prolapse can get very infected and can cause death just do some searching here one BYC and you'll find a few that found this to be true.
So in closing, I found you advice to be not in line with what I would do and I though it could be life threatening.