Board Thread:Naruto Discussions/@comment-24373005-20141013001519/@comment-25229554-20141013123258

TheUltimate3 wrote: The source was an asspull but we need an actual reason for that which hopefully will show up in the databook.

Though in Kakashi's sense, it doesn't make much sense either. He got Obito's Sharingan when ghost Obito broke physics and came back from the dead for a minute. That alone is simply asspully.

Actually when you think about it, the only one who made sense this arc was Sakura.

Sakura's probably the only one whose power growth is reasonable.