Maybe if the Labrys player jumps right in front of you, which they never do. It's usually a smack in the side of the head with the axe. The blockstun and hitstun is so insanely high she can confirm from anywhere.
Anyway like I said, I'm not going to pick a match where I can either get 300 damage for making the correct anti-air of lose 50% of my life against Sentinel. It's time to move to a character that can stop cheese before it gets started. At least no one can claim Mitsuru is weak.
The only part that sucks about this is starting from square one with combos. I knew I should have listened to my gut when I bought the game.
You get 5A into a full combo if you AA right. If my execution was decent I could punish for about 3k with 25sp.
If they IAD dash and do B as soon as possible you can AA it FREE. If they try to cross up its a free rollout. If they do it same side you also get an AA. If they try to space it so that the IAD crosses up you can 5C them.
All of these options minus the rollout give you a full combo into oki.
Lastly the slide is punishable after the blocked grapple if you IB hit slide and 2a into a full combo. You just have to respect the grapple which is perfectly fine since if you jump you get a free whatever the hell you want. Yukiko isn't a fullscreen zoner anyways.
The only issue I can see the is the Overhead after the grapple since you can't punish it regardless of what you do. You do get a free "get off of me" with dp or awakening super though if you have good timing.
Yukiko is all about spacing. 5A will win a lot of anti airs, 5C will wins ones that 5A won't and vice versa. Lastly you also have other options just to get out if they do IAD crossup B.
edit
Of course there will be hard matchups, its just the name of the game. I don't know why you are comparing lab to sentinel, considering they play nothing alike nor have similar playstyle at all.
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you can grab after the slide if you read they are going to mash 2a all day. free counter throw.