What? AoE of St man you don't know much about pain do you. There is no AoE Its not a sphere, he basically controls force at will, and can push anything from anywhereFirst of all, what makes you think that Deva can make all the Peins gain flight? Second, what makes you think they can successfully do so when Gaara raises his sand near instantly [You must be registered for see links]? Not to mention Shukaku as well. And what do you mean Gaara would have to use his gourd sand? The desert sand can do everything the guard sand can.
The AoE of ST would hit all the Peins as well, you know that right? Plus, it would only momentarily deflect the sand... once the repelling force diminishes, the same sand then proceeds again to overwhelm Pein and exploit his 5 second intervals.
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He doesn't have to make a sphere. (Naruto was on preta, preta was not moved. He can push whatever he wants from wherever he wants ( Well in a relative range of course) That is how he mirrors flight, no reason to believe he can't have force act on other pains as well. He only needs a moment once the pains are launched all of gaara's non gourd sand would be near the group of pains so he'd have no choice but to use his chakra infused sand which is constantly near him.
Shukaku? Tailed beast chakra still gets absorbed.