What is this madness?
You can't poke on reaction?
You can't anti air on reaction?
Maybe you can't, or at least don't try to.
So while you wanna go into theory fighter, how about this, how about doing it preemptively?
If Jin or Hakumen do jc in reaction to an airborne Ragna, what the fuck is he gonna do? Use jesusc and somehow beat you to it?
Why are you standing around letting him?
And what's this shit about not being able to anti air on reaction, if Ragna is in the air, in Tager's air space, what's gonna stop the man from ACing? What is Ragna gonna do? Break the grab?
You don't yomi an anti air, well--you can, but that's not how anti airs are used.
Arakune's 2b, clashnig at worse is a 50/50, if Ragna is in his face you have to take into account that Arakune's 6 frame 5a has longer range than Ragna's 5 frame 5a, and the clashing part went under the assumption that Ragna is actually spacing his shit. If he dares run in on a clash, he'll eat or block a 5a, allowing Arakune to jump back. If he doesn't space it, I guarantee you 2b will stuff his jc. I've tested this and used it in real time matches.
If Ragna can do 5b and connect, he's gonna block string you, learn to Ib and punish his follow ups, If Ragna doesn't commit to a 5b, his opponent can get away. That's where 5c and 2c fits into this.
Punishing something on IB always makes a difference. It makes a move--and follow me here--unsafe on Instant Block. And IBing Ragna isn't hard at all, it helps you punish his shit and he'll have to commit to something and hope you don't.
Now on the subject, Ragna's approach is risky, unless you are Tsubaki or Noel or something.
Fact of the matter is you shouldn't be standing around, eating 5b and jcs for free, that's sloppy play from you.
Learn some footsies.