Board Thread:Metal Gear Solid V/@comment-109.193.182.64-20150922080055/@comment-27404568-20160901124715

Personally, I think the reason why Sahelantropus and REX are not the same is that they were built and designed for completely different purposes. Sahelantropus was designed to be a mobile front-line combat unit and terror force, with nuclear capacity only as a self destruct. Rex, on the other hand is designed to be a mobile nuclear weapons deployment system.

As for the design and armament similarities, Otacon could have simply taken inspiration from Sahelantropus in designing REX.