I propose an alternate story involving Western Union man.
Just a little thought, as I always liked this character, and thought, maybe he COULD have actually helped! haha
So in part 2 when Western Union mans says Kid, you all right? You need any help? Marty McFly: There's only one man who can help me.
Marty then starts to run off, ..........but now instead, then he stops, and turns back, and comes back and says, "wait! ..... I need a lift"
After while getting a lift back to Doc, Western union man tells Marty that holding that letter has been the most important thing in his life, as everything else has fallen apart for him, and now that the letter is done, he basically has nothing to live for. He pushes Marty for more info, and Marty finally tells him everything, and he pushes and pushes to help Marty.
The drive finally gets back to 1955 Doc, just as Marty from BTTF1 gets the lightning bolt and goes back to 1985. Doc Cheers in the street, Marty runs over to him, and just like how part 2 normally finishes -
Young Doc: No! It can't be! I just sent you back to the future!
Marty McFly: You did, oh, I know, you did send me back to the future, but I'm back - I'm back FROM the future.
Young Doc: Great Scott!
Then we see Western Union man, step out of the car, in shock, and the screen fades to black.
Having witnessed this all from the car after dropping Marty off, refuses to leave them alone, but they eventually start to trust him.
In part 3, when they read the full letter all together and discover the DeLorean is in the cave, Doc and Marty decide to let Western Union man go with Marty back to 1885.
Maybe through the movie, Western Union man finds his true love or true purpose and wants to stay there?
Anyway, I thought he could have been a hilarious third wheel in an alternate timeline.
Instead of Clara on the BTTF3 poster, its Western Union man, hahaha
