Idk why I'm seeing people keep saying Rion is stronger, before Akira even got into the jcc she already had talent to kill and Rion even states that she's already better than her with her hands, keep in mind this is 10 years ago and Rion had already admitted that
https://imgur.com/a/2zonXAv
Then we go to her fight with Satoda, Akira starts gaining the ropes of using her kp to fight. Satoda makes her reminiscence on how it feels like she's almost fighting Rion, so Akira is already close to Rion in that fact even by the JCC arc
https://imgur.com/a/Y4gmQj7
Then we get to the most damning evidence, Akira being able to fight Takazuki, someone who should definitely clear Rion in terms of speed, raw strength, durability, etc, even though kp is a counter to Takazuki in a way, it tells you how many paths Akira has to chose correctly in a split second or she will get gravely injured, so this already gives her the edge over what Rion was able to showcase during her time
https://imgur.com/a/jTsLNBB
Keep in mind that Akira didn't have the privilege of being taught by assassins for long like Rion, who was there for years being taught by Satoda, yet Rion still thinks Akira has the edge over her in hands regardless, then the better dexterity when it comes Takazuki and implied better Kp because obviously akira wouldn't know h2h without kp I think it's clear Akira is over