As a kid, I found myself searching for a moral for this story, because I never believed there even was one. So recently I heard someone mention this, word for word:
"So what’s the moral of this story? Well, it turns out that there are actually two: Anyone who tells you to turn your back on the world is your friend, and don’t turn your back on the past because it’s very possible that someone was just taking advantage of your stupidity the whole time."
This very statement hit the nail on the head as far as Timon and Pumbaa go. So its six of one, half a dozen to the other for me.