Heard you had some difficulties with spamming Mitsus. Yes the can be annoying, especially when lag comes into play, but that stance he has with his sword sheathed ready to do "any of his unblockables" (he has 2, he can only use 1 in this stance, Relic, though it is ferocious)
Here's a tip against it, the longer he holds it the more range it has. The longer he holds it it switches from High to Mid to two Lows.
Here's what you do to avoid any issues: if you're close to him and you see him do it duck immediately and quickly do a while rising, so even if he does the quick high GI it misses you and you get your free attack. there is nothing you can do i know of that will stop the second mid unblockable because i dont think its steppable, just follow the former advice. the double low though is jumpable.... If you need help against Mitsus though feel free to get some training in with me, I can tone down style to replicate spam scrubs if that's what you have problems with.
Peace