<Snipped quote by Yatagarasu>
Huh?? After all that, you’re on her side?
I'm not on anyone's side, I'm just trying to make sure you both understand what just happened. You're closer, so I'm going to start with you.
*Pauses*
Imagine for a moment, that Shion decided to start doing everything you like to do. She starts out and is immediately doing everything at twice the speed and twice the accuracy that you do them. She does each thing just... better, in some way or another. The only thing she doesn't do is your passion, detective work. Everything else she just knocks out of the park.
*Waits a moment in thought*
Then, one day, you invite her to watch you as you go about investigating a mystery. You plan to show her how amazing you are, and to have fun with your sister by doing so. But then, when you get there, and have spent a little while searching for clues, she brings forwards the key information that solves the case. She shows that she's able to beat you, even at the thing you're most passionate about and put all your effort into. With me so far?
*Holds a second before continuing*
Then, after she essentially solved the case on her own, you find out that the reason she found the clue was because she knew what had happened before it even became a mystery. She had known what had happened as it happened, rather than having to piece it together afterwords, and she even had a role in directly causing it to happen in the first place. How do you think you'd feel if that happened?