Board Thread:Naruto Discussions/@comment-945885-20140709082448/@comment-24593592-20140712171403

Elveonora wrote: Man of Sin wrote: Having one's chakra does not give you their KKG, though. If that were the case Orochimaru would not need to switch bodies into order to gain the sharingan. He would have just absorbed Sasuke's chakra like did with Kabuto. It does (Rinnegan says hello), but the chakras have to merge first I believe, something that apparently takes some time.

Madara already had the Rinnegan, a watered version known as the Sharingan. Plus, the Rinnegan is special as you need to be near death to get it, unlike other KKG.