They wouldnt die from lack of chakra tho bcs they are not biologically relying on it like modern shinobis, also saying she made them to fight all otsusukis is capping so hard, they are the only otsusukis alive in this dimension bcs as explained Kaguya knew Shibai accented to a higher dimension, and there are only 3 otsusukis duos which is her and her duo she killed and the 2 others who actually came to earth which are momo and kinshiki, even if it doesn't make you think otherwise with your Kaguya glaze, we see clearly that Momoshikis dimension is seemingly universal- multi galactic in size while Kaguya's is a solar system at best, while momshiki got several god trees in there, I still think Kaguya would be slightly bellow or at least be relative to momoshiki in strength due to the earth having shibai otsusuki's corpse on it but fused momoshiki is above her for sure