Okay with 5th gate, this becomes a closer fight. Sakura still wins mid-high difficulty though since Gai can't kill her and can't do anything if Sakura decides to outlast him by standing on top of Katsuyu. Katsuyu doesn't become useless, its minis can still surround Sakura, making it problematic for Gai to actually come close because they'll form a moat/barrier around her. Sakura wins because of her stamina and range advantage (
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).
Omoi sent her back flying back before Sakura ever had the Yin seal. Furthermore, Sakura was going for Karui, Omoi blindsided Sakura while
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Feats show Sakura being faster with the Yin seal than ever before (
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)(
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)(
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)(
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) and a chakra upgrade has always resulted in increased speed as evident with jinchuriki chakra cloaks, senjutsu and even Deidara's C1 chakra (
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In scan (
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), Kaguya was escaping Naruto and Sasuke by flying upwards but then Sakura came above Kaguya, she still managed to land a hit despite Kaguya's speed (
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) and this was before Kaguya's recent powerup which made her even faster (
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). Sure Kaguya was travelling upwards right into Sakura but Sakura managed to react to Kaguya coming upwards and successfully connect her punch instead of Kaguya's own body smashing into Sakura before Sakura being able to land a hit. Again if Gai tries to rush Sakura like that, he gets pummelled.
In scan (
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), Sakura manages to react to incoming chakra arms from Kaguya and temporarily avoid them for a few seconds. Naruto mentioned these chakra arms are extremely fast, you do the math. What feats does 5th gate Gai have that put him on this level of speed? Absolutely none. Now don't get me wrong, Sakura is no where near the level of speed compared to the chakra arms or 5th gate Gai but my point is her being able to visually and mentally keep up and still able to physically react even though no where near as fast. What this means is that all Sakura has to do is move her body parts a few inches and Gai's attempts at decapitation fail miserably.
Scan 3 is self evident but let me explain it to you what is so significant about it. The portal was only 2m away from Sakura/Obito. The sea of acid has a fairly large AoE and despite carrying Obito, Sakura managed to cover a pretty large distance. BTW Obito himself couldn't save himself in that situation and the guy was fast enough to react to high level speedsters. I know Obito was weak and tired but don't act like Sakura was at 100%.
In scan 4, Sakura managed to catch up to the Juubi clone that she herself sent flying away with her immense strength. The speed of the Juubi clone left a smoke trail.
Correct me if I am wrong, but base Gai's best speed feats in part one include blitzing part one team 7, no named sound nin and part one Gaara's sand. None of these are any impressive and Sakura is easily capable of doing the same.