You can't go off of that. :|
Shikotsumyaku
As descendants of Kaguya Ōtsutsuki, a select few were able to inherit the Shikotsumyaku kekkei genkai, a derivative of their ancestor's All-Killing Ash Bones Kekkei Mōra, which allowed them to manipulate their skeletal structure to weaponise bones for battle.[1][2] This ability was so powerful, regarded as the ultimate taijutsu ability, that the other members of the clan feared it.
Apparently, the members who possess the Shikotsumyaku abilities have a different body structure than others, as when Kimimaro was fatally ill, Kabuto Yakushi claimed there had been too little information on his body to give any medical treatment.[3]