Board Thread:General Discussion/@comment-79.52.61.188-20130415085048/@comment-6747658-20130415110227

Well, so far it is still a mystery as to why he did such, it has not exactly been told in the current canon as to why he did this.

My thoughts on it? He pulled the "keep your friends close but your enemies closer" tactic, as under FOXHOUND it would seem that Big Boss has finally accepted the offer originally extended by Paz in Peace Walker and has come to terms with Zero. But in the meanwhile he gathers his own resources and influence to create Outer Heaven. I reckon he figured they would not suspect him when he was doing this all right under their noses.

Hopefully the upcoming games will shed more light onto why Big Boss returned to FOXHOUND and became it's Commander.