The only lightning jutsu that pierced Gaara's sand was chidori, chidori is a piercing attack, it focus the lightning chakra into one point for it's power. This is described by Gai when Sasuke first used it
Gaara got his sand ability from Shukaku who displayed using wind jutsu
Gaara was able to block A's leg drop even though A have version 2 lightning armor increasing his power
Some people say Gaara can't tank Kirin which I believe is false. First off Kirin isn't even chakra made. Second it's not a piercing attack, it's a destructive attack. Did Kirin go thru the mountain or destroyed it? Gaara shown to tank a stronger destructive attack, Deidara's C3 that had a larger blast radius
Like I said in the beginning, it still falls in the speculation pile until his chakra nature is confirmed, same as it's speculation that sand is weak against lightning but it makes more sense that it's not weak against all lightning jutsus but focused/piercing attacks.
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. That doesn't mean all lightning jutsus can overcome Gaara's sand nor I remember seeing another lightning jutsus do it. Since we have no actual manga prove this falls into the speculation pile but I'm sure Gaara's sand is Wind+Earth, which would make it made from lightning's weakness (wind) and an element lightning is stronger than (earth) but as we seen with Kakashi vs Kakuza when he used water jutsu against wind+fire, that water alone wasn't enough
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.Gaara got his sand ability from Shukaku who displayed using wind jutsu
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. Gaara is also from the wind country so either he already had wind on his own or got it from Shukaku. Gaara was able to block A's leg drop even though A have version 2 lightning armor increasing his power
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. the armor increases A's speed, power, and defenses. He used it light his father, like a chidori like attack to cut off one of the 8 tail's horns
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. If Gaara's sand was really weak against lightning then it wouldn't be able to stop A's attack. I read someone say A's armor is just lightning chakra on A's body which is different but it's not, chidori is lightning on your hand and chidori lacked the power to impale A
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.Some people say Gaara can't tank Kirin which I believe is false. First off Kirin isn't even chakra made. Second it's not a piercing attack, it's a destructive attack. Did Kirin go thru the mountain or destroyed it? Gaara shown to tank a stronger destructive attack, Deidara's C3 that had a larger blast radius
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. His sand is strong enough to take on 4-5 of Madara's complete Susanoo's swords in a weakened condition (not at full power).
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Like I said in the beginning, it still falls in the speculation pile until his chakra nature is confirmed, same as it's speculation that sand is weak against lightning but it makes more sense that it's not weak against all lightning jutsus but focused/piercing attacks.