There is a glitch with the Blade Reflect. If Kenshi reflects a fireball and holds forward, all immediate fireballs get reflected too, so you cannot spam instant aerial fireballs on him. The Blade Reflect has a smaller "reflect" window than Nightwolf's Reflect does, but Kenshi's version is safer when whiffed. Besides, the slashes have a thick hitbox and do 10% of damage. Sindel's regular fireballs all do 8% of damage. So, Kenshi wins all trades.
Kenshi kills Sindel up close. Unless Sindel has X-Ray, she has to block f+2,2,b+2, Spirit Charge every time. The Spirit Charge cannot be interrupted or jumped out of. Once the player is trained to block the Spirit Charges, Kenshi can repeat f+2,2,b+2 and build a lot of meter. Kenshi also has a better AA and wake up game. I doubt it is even up close. Sindel has to block Spirit Charges after blocked Step Up Kicks too. She cannot jump away.
Add my cousin. The name is HawaiianDrink. He has already played like half a thousand matches with Kenshi off-line.