Lol,do you like my answer ?I posted this before his response. Kind of the contradiction here. Anyway cheers.
Kaguya was greedy,maybe she did it becuase WhiteZetsus had chakra,and whenever she would run out of chakra in battle against someone then the Zetsus would give her chakra.
She was chakra greedy,for example if Momoshiki and Kinshiki fought against her then it wouldn't be that easy.
But that doesn't means Momo>Kaguya.
Kaguya run out of chakra against Naruto and Sasuke.
So she wanted to create a army for that purpose.