That is a great idea and excuse for PC pushing. Could be as simple as being manipulated by some local kook that uses a little mind control and limited info about the group to the full world manipulators. Either way those PCs that may be more distrustful of others now have some fodder to work with.
I've read this over now several times, and the idea keeps growing on me with each repetition. As a general rule, I need to have a reason for something before I try using it in a story, and this really does help explain the mysterious helpful stranger. I like it rather a lot, actually. Excellent work, Pieh!