Comparing Yin and Yang is like comparing light and dark. Those 3 duos do not represent light and dark, but simply have different personalities. I still don't think they fit in as well as the others.
I'm not sure how is Sakura supposed to be light while Hinata is dark. A lot of your examples makes no sense.
The Yin and Yang and parallels of the series are Naruto/Sasuke, Harishma/Madara, Jiraiya/Orochimaru. It doesn't mean that any rivalry is automatically supposed to be a parallel, or a yin/yang. That wouldn't make sense.
I do agree that Kishimoto is a smart writer but not for the same reasons apparently.
Think about it, light and darkness are both elements, just executed differently. Sakura and Hinata both have the same drive, but have diffferent personalities, sakura was shown to be jealous of hinata's chest(meaning theres social/internal connection). And both these characters are love interests of both the main heroes. Its not an accident, light and darkness doesnt necesarily mean that the opposing forces have to be evil or good. They just have the same drive. Sakura longs for sasuke's attention, hinata longs for naruto's attention, sakura isnt scared or afraid of approaching sasuke about how she feels. Hinata is scared of approaching naruto because of her self esteem, see where this is going? they both have the same drive, but have a different route of getting to their goal, eventually they both develop these traits the opposite have.
Sakura needs to get a bit of motivation from hinata's drive (which she did recently when she went to save sasuke instead of relying on naruto to do the work), while hinata needs the boldness and more convidence that sakura has. Hinata's conquering her fear slowly because she also saved naruto by wake up slapping him and they had their little hand holding scene as well.
Just like how sasuke's drive is motivated by the fact that he was robed of "love", took a more negative route to find out that love got him where he's at, same thing as why naruto's motivated by not having love. But through self encouragement (sasuke lacked because he was driven by itachi's say and orochimaru's bait) and a bit of love from selected few he put in his circle he learned that it was love thats gotten him to where he's at.
Darkness and light doesnt necesarily "good or evil", They're both an element and a force of nature that coexist because they're similar, there is a reason why yang has a hint of ying in it, vice versa.
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This image is a perfect example of that, the tiny opposing circles in each side means that each side has a bit of both force in it, but both dont have "enough" to function properly alone. Only together can they function properly and prosper.