Because the MP and HP knives have more recovery frames.
But yeah, Chun is bullshit.
I personally really like the Ibuki vs Dudley match. Ibuki has a lot of ways to keep him out of the air and Ibuki’s low pokes can really give him a hard time. Dudley is also one of the tall characters, which lets Ibuki use her full range of moves and target combos without worrying about standing/crouching stuff. In this match I feel Ibuki can play both very aggressively or very defensively, although the major concern is getting knocked down, since Dudley’s own pressure game is very very strong.
I wouldn’t say that this is a “bad” match-up for Dudley, but I would say that it is at least a good match-up for Ibuki.
As for Hugo, I personally feel you have to play that match very cautiously. Although it seems like Ibuki can walk all over Hugo for free, a few mistakes or parry-baits could end up putting Ibuki in a world of pain. Any time you try and set up a parry bait, you could get grabbed, and any time you use an unsafe poke string, you could get grabbed, and any time you do a move with frame disadvantage, you could get grabbed. But it’s not like Ibuki has to play this match aggressively at all. If you play defensively and just shut down Hugo’s offense, the match becomes a lot easier.
Alex is kind of interesting. I play against Alex a lot and I feel the match is in her favor. But the interesting thing here is that he can be dangerous if he gets an opening and starts to rushdown. His jumping attacks are actually rather hard to anti-air and are quite dangerous if you guess wrong, since they lead to stun combos or tick throws, both of which will put Ibuki in a very bad spot. Though I feel that on the flip side, Ibuki can really put a lot of pressure on Alex and easily rush him down, since Ibuki has a lot of ways to get in and force an opening against him. A lot of the time she is safe, so it’s really just a matter of forcing that opening and keeping constant pressure and rushdown, all while mixing it up.
Remy, I dunno. I can’t really speak from experience against Remy, since I don’t get to fight a lot of good Remy’s. However, if your main problem is getting in on him and creating an opening, remember the basics: Ibuki has a lot of frame advantage almost all her moves. Use your pokes and keep moving in while setting up parry baits. Low jabs or low shorts, low forward, slide, EX knives, toward+MK – Anything that puts you in his poke range. Once you’re there, expect him to try and poke you to get you out of his space, and parry then knockdown. Mix this in with tick throws and fast pokes. Keep him guessing about what you’re gunna do : “will you parry, will you poke, will you throw?”, and keep the pressure on untill you got him locked in the corner. And remember to use standing MK when you think he’ll parry low, and also to set up tick throws when he blocks. Even if he techs the throw, you still push him further into the corner, which is where you want him.