There is a reason medical ninja avoid offensively using chakra scalpels. It is a surgery tool used for flesh, not multiple non permeable layers of hardened sand. Precision plays no factor here at all.
Kabuto was a rare and uncommon case of a medical ninja who used chakra scalpels offensively and the most dense thing he managed to cut was puppet wood.
Please just drop this one.
Kabuto cut through wood, as well as an entire person, but Sakura doesn't even need the scalpel, her punch is more than enough, a simple slap from base guy disbursed gaaras sand, base Sakura simple punch could break Kaguyas horn and cause massive damage to the ground. Sakura punch can literally turn back her sand on him as well as disperse it .
Ot: Sakura can extend her byakugou to Hinata and produce and airpalm on Kaguyas level