[@Masaki Haruna] I imagine there's a difference between 'Attack Speed' and 'Movement Speed'. It's a lot quicker to flick your wrist and swing your blade that it is to recognize the blade is coming and then move out of the way.

If Ria [i][b]is[/b][/i] slower that Rock Lee speeds by a significant margin, I can still see a workaround for Ria to still be 'fast enough'. The way I see it is maybe Ria's Chidori is more of a literal lightning blade, her sword swing/thrust getting the right amount of speed for it to be used? Like the image of a jet breaking the sound barrier, but with it bursting into lightning instead of a sonic boom. The ultimate "Stab" in simple swordplay.

(Totally not suggesting this because "holy shit Rock Lee fighting anyone other than Gaara and human paste may be made" is scary and Kei would be scared :P)