Board Thread:Naruto Discussions/@comment-1043414-20140724205217/@comment-4271790-20140726220823

I said "in a tailed beast's case." Not a human's. Tailed Beasts are also known as "Chakra Monsters," maybe Yang Kurama's chakra grew back. Yang Kurama took chakra from Yin Kurama, but didn't show signs of getting stronger than before. Like Steveo920 said, the time period was extended. In a human's case, there are chakra reserves and the individual strength of a person due to chakra. For example, with his MS, Itachi's Susanoo is stronger than Sasuke's, but Sasuke has greater chakra reserves, and can use other chakra-taxing techniques in conjunction with Susanoo.