What was the end result for Jim Cunningham (the 'motivational speaker' played by Patrick Swayze) in Donnie Darko?
After Donnie completes his task to revert the time-line to the original 'correct' one (let's call it the 'primary' time-line), many of the things he did during the interim are reversed or negated. E.G. 2 characters who die in the secondary time-line are obviously alive and well once it is changed back to the primary time-line.
Donnie, during the course of the secondary time-line, takes a disliking to Jim and when he finds his wallet lying in the street, he uses the information to burn his house down. It turns out that Jim is a paedophile, and the police discover evidence of this in the ashes of the fire. He is arrested and his life takes a turn for the worse.
Then ..Donnie reverts the time-line..
So does that mean that Jim was never discovered, and is still an active child molester?