kirin didnt destroy any mountain,if it did,sasuke would be dead since he was on the mountain. It just destroyed the uchiha hideout and itachi's incomplete susanoo.the mountain was well intact after the kirinKirin reduced a mountain to rubble. Unless Gaara is in a desert and given enough time to gather a huge amount of sand, which he won't with the speed of Kirin, then he won't tank it.
People underestimate the destructive power and nature of Kirin. It is a huge lightning bolt, very different from regular lightning chakra. The third would be hit by tremendous force, electrocuted, and burned by high temperatures, I doubt he can just walk away from that.
If gaara's sand protected him from a meteor,then kirin is no problem.
Kirin is too overstimated