Board Thread:Wiki Discussions and Support/@comment-4271790-20150210213549/@comment-27082825-20150211150200

I believe it was injected into his body an infant or toddler, as opposed to the middle aged Madara and Danzo respectively. Not fact, but could have something to do with it. Perhaps a more stable version, as he was the most recent out of those three to be subjected to it. (^^or what Tau said.)