Sasuke was on the stone slab on that same mountain.
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If mountain was destroyed how did sasuke survived. I want to say over here is that we have seen Kirin only once so we cant judge its effectiveness yet because no one died from it, neither the target nor the caster nor the spectator(Zetsu) wherease rasenshuriken has killed everyone it touched 10/10(not talking about edo tensei Raikage) so we know for sure:
1) RS: Lot easier and faster to make and throw.
Kirin:Very time consuming if thundercloud not present
2) RS: Takes much less Chakra compared to Kirin making
Kirin: needs setup like use of katon techniques and/or amaterasu which takes too much chakra.
3) RS: If the technique is known to enemy, the enemy should pray not to get hit by it(cant stop the process of making it) other techniques are absorbing it(rinnegan ability).
Kirin:if the technique is known to enemy, then the enemy can stop the process by removing or stopping thunder clouds(Game Over for the Caster)
4)This is the most important
RS:multiple throws with various variation like(mini, large,etc)
Kirin:Single try if hit goal otherwise if miss the caster is f**ked..