After last patch it's Ninja who I think has an issue. I'd need to calculate the actual frame data to be certain but I believe quick slash is mathematically impossible to play around effectively. Pre-patch you could mix up incoming quickslashes by jumping, and then easily punish a whiffed one or carry on with something else out of your jump if they didn't do it. Now with jumpsquat jumping won't get you out of the way quickly enough, so you're forced to parry, and if they choose not to quick slash then Ninja is fast enough to just run up to you and punish the missed block. Basically if they have one in the chamber you are guaranteed to have to guess for parries or else they can just hit you with a quick slash and kick off a 15~ hit combo guaranteed
Been abusing this tonight, sorry to anyone who got owned