User blog comment:D.Ryan/Big Brother Enemy Scorecard and Drawing/@comment-1732397-20100811153333

The Big Brother could have been only Little Brother that functioned properly and was bonded with a Big Daddy. He was somehow saved and lived on the surface living a normal life, but something happened to him that caused him to regress back into his conditioning and return to Rapture and restart the cycle over again. During BioShock 3 I believe he would be used by the game's primary antagonist to further his plan.