Board Thread:Theories and Speculation/@comment-5407586-20150323222735/@comment-5936871-20150328051955

Well it's been stated that the more tails they have the stronger they are. Hagoromo also said the reason he was able to appear before the Hokage is because of Asura, Indra, and Kurama's chakra within Madara's severed lower half. This implies that Kurama's chakra is special out of the other Tailed Beast, which is obvious considering he is the strongest and he is the only one with that unique mode of his. Hagoromo most likely gave Kurama most of the Ten-Tails chakra out of the other Tailed Beasts when splitting it up and dividing it.