Ok, here is what can happen with a personal prophecy, especially if it is flattery. I am not saying all do this, and I believe in prophecy done in a conservative manner.
If I get a personal word, that says I am called to greatness, and maybe be told I am "going to the nations", or this or that, I could now undestandably base my life around that word. Who wouldn't want to?
Ok, now the hook is set, for me to let go of the leader or so called prophet, if I realize he is not a prophet, or his teachings are wrong, means I have to let go of the prophecy and my dream too, that which is built around the prophecy and the one who gave it.
The connection has to be there, the prophet and his prophecy go hand in hand, if one starts to disbelieve the leader, one would tend to not trust the word, given by a leader who my not be a prophet after all.
So now it is even harder to let go of the leader because I now question my goal, that which was a big one, due to the grandiose vision given to me. The bigger the flattery, the more one wants the big goal.
If I were told I am called to serve hot soup to the poor, that is easier to let go of..
Sorry, sad but true, human nature is what it is.
So now, the prophet owns the person, by way of association, because for the young convert to not be into the teacher anymore, means he as to let go of the directive prophecy, and what he was building his life around.
It would be a reflex connection, drop the prophet, drop my personal directive.
Who wouldn't now worry, if the word was from God?
I say this because the people in the OP title, are big on personal words, and again, the guy in my town, is now building his life, believing he is got this really big call!