Darui isn't blitzing her. Sakura was able to keep up with Naruto and Sasuke, blitz Kaguya in the end and dodge her when she was in her rabbit form.
Sakura standing by screaming "Good Job Naruto" is keeping up with Naruto and Sasuke?
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Sakura dodged her in Rabbit Form? This scan shows her running away only to be caught anyway (before Kakashi saved her)
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Blitzed Kaguya? How does Sakura landing a hit on her count as a blitz when
One: Kaguya was unaware of her.
Two: She was being assailed by three Ridoku level shinobi at that time and thats where her focus was.
Three: That whole attack was a plan created by Kakashi.
Four: Sakura didn't have to travel all the way from the ground to get above Kaguya (if you want to make that argument) because she was still in one of the wings of Kakashis PS lingering above.
Five: Kaguya had no where to go but up and Sakura was already coming down on her so they would meet eventually.
I can keep going with these. There were too many factors in that fight that led to Sakura hitting her and none whatsoever are because Sakura can "keep up with Naruto and Sasuke" or that she "blitzed Kaguya" Nice try though.
Where I said she can dodge Ay's attacks? Last I checked this was a Darui vs Sakura thread, who is nowhere near as fast as the Raikage.
Visually keeping up with someone =/= being as fast as them. This is common sense.
Manga disagrees:
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They started in the same location and ended up in the same location, their attacks even landed at the same time, all this despite Darui carrying his sword with him.