If Discord needs an Ethereal by his side so he can stay a god and only one was reborn within the barrier assuming it isn't Twilight since Void didn't know she was reborn for a 7th time then my theory would be that since he stays close to Fluttershy and tries to have activities done together more then Fluttershy is an ethereal that is yet to be exposed. Also it would be an honor if you were to use my theories in your story should you ever need them

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That’s a beautiful take on Fluttershy’s past life story! I love your thoughts and theories on it! Unfortunately I don’t think I have time to put Fluttershy’s past life in. But if I do I would probably take some of your idea and implement it. It’s a really good idea! Discord unfortunately is going insane because of the loss of his divinity and the only way he was able to get some was by staying by an Ethereal. But those are very rare and because of the barrier only one was reincarnated inside. From this information what other theories can you come up with?

I took time to think carefully because the ship between Fluttershy and Discord is one of the best, only second to Twilight and Sombra. So my theory is: just like his father, Discord can make little chaotic creatures that he can send in the world all the time, however, when one was trying to mess with Fluttershy, she fed it, groomed it, and gave it a home. At night, when the creatures returned, he noticed that one of his most powerful chaotic creatures didn't return, so he used his abilities to find it, and when he did, he was surprised at how Fluttershy treated it. And Fluttershy noticed him, so she showed him kindness, so after that, each day he would spend time with her and have those tea parties he loved so much. But one day, the day when the other alicorns started the war on the other "inferior" creatures, he tried to protect her with all of his powers until one alicorn managed to use her teeth to chop her head off, he blew into a rage and his powers were out of control. So he massacred every alicorn he could see, but Void, seeing his son in pain and rage, used his abilities to force him to come to his plain so that his anger would dissipate. After that, he was sent to destroy Celestia by his father and we all know how that went.

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Will Applejack and the rest of the Main six forgive Pinkie for her cannibalism? Yes, to a point. Most will forgive her but they will never forget, because of the forced cannibalism. As for seeing the past lives I'm only going to do one more. Why? because this story is already long and I need to cut some things out. Too many ideas going on and not enough time. Though I would love to see your theory on Fluttershy. It is so much fun reading other people's theories on my story. Let's hear them!

Wow! Reading closely and imagining what would happen in the future was helpful. As for any other questions I have:
Will Applejack and the others forgive Pinkie when they know why she is doing cannibalism?
And almost all the others remember their previous life, assuming that Rarity and Pinkie will remember, will Fluttershy remember her previous life? If so, I have a theory that she will remember what her and Discord used to be in her previous life.