Originally Posted by sn939
If you're referring to the Doc of the final timeline, who showed up in Ep. 5, then I don't see why the temporal duplication wouldn't have happened. While Doc's life was different (he had a good relationship with his father, and ran his father's foundation), his path was essentially the same as that of the Original Doc's. He came up with the idea of flux capacitor in 1955, met Marty, invented the time machine in 1985, went on all the time travel trips we saw in the movies, INCLUDING the trip to 1955 in which the Delorean was struck by lightning, sending HIM to 1885 and the temporal duplicate Delorean to 2025.
I've been thinking about this. I still think it is entirely possible that the DeLorean was never duplicated in the new timeline, and it's even possible that the DeLorean Doc picks Marty up in in 1931 is actually the original DeLorean.
The only trips that have to happen to make the OUTATIME outcome is the first 1955 trip and the 1885 trip.
The events of 2015 that led to Hell Valley had to do with Marty being greedy and wanting to make himself rich by using time travel for personal gain. But in the new timeline, Doc had a good relationship with his father, so he might be a better father figure to Marty, helping Marty with his own issues with his father, meaning that Marty might not feel like he needs to get away from his family so badly (this is likely since we know family means more to Doc than before since he originally went to 1931 to investigate the arsons and in the new timeline went to investigate Marty's family lineage).
So, because Marty would have an improved relationship with Doc, he might not have even ever have been in the accident with the Rolls Royce (since Doc would teach Marty the importance of family and he wouldn't be overcompensating for the thoughts of him not wanting to be weak like his father).
So the 2015 trip might not have happened. And it wouldn't have had to have occurred, either. Combining the outcome of the 1955 trip (which George McFly became someone Marty was proud to call father), plus Doc's instilling the importance of family to Marty from the beginning (and the fact that the Rolls Royce incident wouldn't occur), Marty would be a better father to his kids, his son would never get mixed up with Griff, and his kids wouldn't go to prison.
There's nothing in 2015 that's important for Marty to do in this timeline (although it is important for Doc to get the rejuvenation treatments, the hover conversion, and to install Mr. Fusion), but he did that all before his trip with Marty anyway.
Without the trip to 2015, the 1985 Hell Valley timeline wouldn't exist, and the second 1955 trip wouldn't have happened. So, the DeLorean wouldn't have been hit by lightning.
So, now Doc just travels to 1885 on his own (or with Marty), which would be likely since Doc stated he always wanted to go to the Old West (and we know that Doc likes to travel in round numbers from his line at the end of the first movie, so traveling 100 years into the past would make perfect sense). But, the events would be very different. We know that Doc must have gotten there before Clara died in the ravine, but we don't know the exact date he got there.
The DeLorean would be fully functional, so Doc wouldn't have been stranded, and he wouldn't have set up shop as a blacksmith. So the feud with Mad Dog Tannen wouldn't have happened. Also, it would be Doc, not Marty driving, so the gas tank would be in tact (or if it wasn't, Doc would at least know to patch it quick before all the fuel leaked out). So, Doc could spend as much time with Clara and leave whenever he wanted.
Doc also didn't need Marty in 1885 in this timeline, since he's not a scared man around women anymore, having experienced first love and loss with Edna. So it's possible that Marty wasn't with him, and if he was, he might have only been there long enough to celebrate at the festival, and left Doc and Clara alone since Doc wasn't in any danger.
Since Doc didn't need to hijack a train to leave 1885, the DeLorean wouldn't have been destroyed by the train in 1985, Doc wouldn't have invented a time train (unless he did it later for fun), and the ravine would still be called Shonash Ravine.
None of these changes would be devastating to the timeline. The first 1955 trip would still improve George McFly's self esteem, Doc's improved relationship with Marty would keep Marty from feeling like he has to overcompensate because he doesn't want to appear weak like his father (so the Rolls Royce accident wouldn't happen and Marty would be a good dad to his kids), Doc and Clara would still get together, and they still would have Jules and Verne.