SEASON 5 SPOILER
 
A flowchart that shows what happened if the Rainboom didn’t occur.  
I made this on my own because I was so bored. So I tried to make a flowchart.
 
If something is wrong, you can always tell. I am open to hear it.
 
CORRECTION: My Twitter username is actually @MLPSmiliePop. Gosh, how could I forget that? 😂
 
NOTE: Remember that if the Mane 6 don’t exist, the Elements of Harmony is still connected to the two sisters, making the seal for Discord not to be broken, as mentioned by Celestia in The Return of Harmony
 
NOTE: This is all just my theories, with a supporting evidence from The Cutie Re-mark. If there’s a mistake, please tell me and I’ll make another one.