First, im so happy when i see another player like using ISword Blizt.
But your video is not make me interesting, probably, your build is good for spamming musou, die easily too, maybe more than me

)
Your C1 is good, but just for fill up musou, is not useful for support or save your friends in battle, anyway is your choice.
About "I CAN KILL ANYONE WITH 1 MUSOU". Of course, with just 2 musou, u can do same thing, but we have 2 big problem :
+ Did they stand and let you stun then musou ?
+ After your musou, what you can do ? (With new player team, u can musou them and stay but if u against powerful players, i think u need exchange ur life to doing same thing)
I see many many ISword user just use stun + musou and that's all they know about ISword...you can find much vids of some elite players on this server with ISword Blizt to learning.
Using evo can let u do 10-13 hits combos during advance's time and now, you dont need musou. Save your musou for other thing, dont need much musou for killing just 1 enemy.
P/S : If you want pratice with it, find me, Yaoshi.JZ1, so i can teach u something about it.