Good points. But I still disagree. It's been shown that one can infuse his sand with chakra to make it even more powerful. In the Databook [
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] it says that Gaara infused his sand with Chakra to make it MORE durable. Why would it say that if it was already infused with chakra? Simple, because it wasn't, and it was using magnetism as its basis for control. Once chakra is infused with it it becomes more durable and even more controllable. Same thing applies to the Yondaime. He used chakra to strengthen his Gold Sand further in a clash of sand power. So Sasori won't be vulnerable to chakra absorption unless he's infused it with chakra, which he doesn't need to do.
Bro, he's a human puppet. Human Puppets even retain their physical strength as shown when he wanted Sakura. You're thinking of this too real life-wise and much less canon wise. he turns them into human puppets, they are still the same but without any organic material. And it was shown in the scan you posted that the Kazekage puppet released magnetism from his own body which manipulated the IS to create the ISW.
I don't see any bubble of force? I really hope you don't mean the white undrawn field though, because that's around many characters/jutsu in the manga [
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][
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]..
Doesn't matter, now does it? Also, Deidara's explosive chakra can be absorbed before it's converted into an explosion. Same applies to Jiton, it can be absorbed before it becomes Magnetism.