Thanks for the tips anyways but that wasn't quite my question tbh. I'm fine execution wise and know how to mix people up. I just feel like Mitsurugi doesn't quite have the oppressive tools other characters have, or maybe I'm just bad at the game which comes together with my next question:
Can you guys react to Seong Mina's 2A+B? I know it's 30 frames startup or something but I have real trouble seeing and jumping over that. Settled with reacting to the stuff she says when using that move, but then met somebody online using a CAS with a different voice set and it was all out of the window. Are you guys able to visually tell that the move is coming and react to it?
When you say oppressive I'm guessing you referring to being able to keep constant offensive pressure on hit or block not allowing opponents to mount an offensive? If so the key to a successful offense is knowing +- frames on your moves and just as important is knowledge of your opponents as well.
Ex. 1 - You input 2a and it connects but your opponent tries to attack. 2a on hit +6 so if his attack is say i15 then the actual impact time of his move is 15+6= i21. You use 4(A) being i20 wins leaving you now +8 allowing free MST BB since it's i8.
Ex. 2 - You input 2a and it connects but instead of attacking the opponent blocks. You use 4(A) he blocks it leaving you now at -2 him even frames. If you use MST b which is i8 + the -2 frames MST b is now i10. For him to beat MST b his move must be quicker than i10 which is still very fast. There's only a couple moves that are faster than i10 so more than likely your safe to keep offensive pressure without interrupt.
Ex. 3 - Your 2a is blocked leaving you at -6. If you attack with 4(A) being i20 move plus the -6 frames your impact is now i26. If opponent attack has impact faster than i26 you lose.
As you can see Ex 1 allows you to keep oppressive offense with +frames on hit. Ex 2 allows you to keep pressure by knowing +- of your offense and general knowledge of each character +- per move set. Ex 3 demonstrate how knowing frame data allows you to make better choices applying offense and defense.
Study frame data and know how much advantage or disadvantage your at per move. A blocked RLC b is +4 so knowing thiese advantages will allow you to better pressure offensively or defend per move.
There's other things like TC etc to consider in most circumstances but frames knowledge is what's most important.
As for blocking i30 lows. Generally yes you should be able to block that move but not always. Go to practice and spend time learning the animation per move perhaps allowing you faster recognition to defend.
Sorry so long hope it helps!