I know, Rei, but if you further calculate out the math and what it really means, it's deceptive.
If you use 2C alone, you are +1 if you gatling into nothing else, -4 if your opponent instant blocks and you gatling into nothing else. That means if he uses it alone, with no gatlings, if you instant block 5B it's literally free unless he dragon punches, because even his 5A is going to be 5 frames, I believe, meaning he needs 9 frames (-4 on block 5 frame jab), and since you're starting 4 ahead of him, you have enough time to throw out even an 8 frame jab(+4 on your IB'ing his 2C, to 8 frame jab = 4 frames, faster than his 5A), not to mention 5B walks all over Ragna's 5A anyway.
But THEN, you realize, in the grand scheme of things, Ragna is probably going to gatling things from his 2C, often, just like most moves. So why are we still safe, here? Well, Ragna's options after 2C are just about all slower than 12ish frames, which is what I'm guesstimating Ragna's 2C, when gatling'd immediately to another move, leaves you desiring (something like 9 frames of blockstun, but 4ish frames of blockstun with IB, 8 frames 5B). Most importantly, IB 5B on 2C beats Gauntlet hades clean, every time I've used it, and that's usually the first thing on a Ragna's mind, especially with meter. That makes this much safer than a guard point, as Ragna gets no chance to rapid > punish; you go THROUGH his move instead of trying to block-stop it.
I know this is accurate, I've been using it and it works, well. Just don't get greedy, if you try to IB 5B his 5C, you often get fatal countered on 2C, and a couple other moves have similar problems. His 2C is your safest interruption moment.
Some time later, I'll research Ragna's frame data and more accurately show the math.