what i mean to say is that saki has been fearful about being found out and lose her friend's affection since the start, and since way before during her entire life she has known she's a lesbian she's always had to hide herself. this would be a great way to focus on saki's development and psychology and emotional needs in a manga that has dealt mostly with kanon's. if kanon sorts out her feelings and.. idk, asks her out or something, we would be robbed of seeing that development because the problem never arose in the first place. saki's feelings would be requited and she will never have dealt with her fear on its own, without a love confession to "solve it". this is a story about their love yes, but also about their friendship and this has been the primary issue from saki's perspective for a long long while. it's not just that she's in love with kanon, but that she can't bring herself to trust her friend to even say she likes girls in the first place (plus, her love for piano is intrinsically tied to her first love for her teacher). if kanon finds out without them touching on their feelings, saki will finally know the relief of opening up to a friend about it and being accepted as she is. she doesn't have to necessarily be requited. she deserves to know kanon would never reject her from her life particularly because of her sexuality. not as a lover, but as a friend. (her life isn't just kanon after all. this is a fear that permeates all her relationships.)
this is also good for kanon's development. kanon has been confused about what she feels for a while now and she subconsciously suspects what it is. if she found out saki's gay it would make it real. one thing is to harbor feelings about someone you think is impossible to entertain, another is to know reality is closer than you thought.
I think you're WAAAAY overthinking this.
The way this is described here is way more dramatic than reality needs to be.
You don't need to go through the 12 steps of queerness before you do anything.
You don't need to come out in a very specific fashion, trauma dump, guage acceptance, wait until things are "back to normal" then ask someone out. (Don't need to come out at all)
You can just ask them out, and talk while a couple of it works out.
She doesn't need to sort out a specific label and hold a press conference.
She can just like a girl and be liked by a girl.
People these days are simultaneously clinging to labels like they're clubs instead of adjectives while simultaneously changing the definitions thereof into increasingly-vague parameters... But I digress.
The point is that you can just live your life as it comes. The future isn't purely dictates by the past.
She does not NEED to bring past drama into this relationship. She can deal with it in other ways.
Why does putting that on one's partner help anything?
Seek comfort with your partner, if course, but that shouldn't be the first thing you do! I ended up in a horrible relationship because of that.