A long time ago I had a theory where I think that in the whole series of MLP G4, it’s a theory that started from season 5 (In fact from Equestria Girls 2), but not many pay attention to those details, timelines.
 
What would happen if the series did not show us the same timeline?  
and that is why he explains the behavior of the characters in chapters that seem inexplicable.
 
Also, the same thing happens with comics, what would happen if the comics are also different timelines? Would that make them canon?
 
For example: Nightmare Moon (time lines where Nightmare moon appears).
 
In season 1, she was the first villain …  
Let’s look at season 1 as the original timeline … in the end we know that Princess Luna was saved.
 
In Season 5, for the crazy Starlight Glimmer´s plan, we were able to observe a timeline where Nightmare Moon won.
 
And finally the comic 5-8, Nightmare Rarity. Many say that the comics are not canon to the series, and they are right … the comics have better stories … but if we see this comic as a timeline or parallel universe. We can see how the Nightmare Moon (in the body of Rarity) returns and how Princess Luna recovers all her power to finally face her, both physically and psychologically.
 

 
There are still many clues that are different timelines or parallel universes … this has been the first example …
 
what do you think?