Board Thread:Naruto Discussions/@comment-24855911-20141108200216/@comment-1512913-20141111000057

Because we reference what was stated in the series. But it's not true. Hagoromo used Creation of All Things to make the Tailed Beasts, they aren't just split chakra of Kaguya. Hint: Kaguya's chakra didn't look like a racoon or a cat or a turtle or a gorilla or a horse-dolphin or a slug or a beetle or an octopus-bull or a fox, it also didn't speak, nor think.

They are as corporeal and alive as it can get. By your logic, Kakashi's restored eye is "just chakra" since Naruto pulled it out his arse with Yang Release (or Yin-Yang Release?) Doesn't matter, point being that Kakashi's eye was restored in a similar or same way as the Tailed Beasts were created and I'm sure you don't consider Kakashi's eye to be "just chakra" or whatever.