Board Thread:Questions and Answers/@comment-74.80.21.175-20150215013110/@comment-25366375-20150217083321

By the events of Metal Gear Solid 4, Ocelot no longer has Liquid's arm anyway.

If I remember correctly, while it started out that Liquid's persona was taking over Ocelot's, he also deliberately furthered the process by self-hypnosis. I honestly can't remember why he did that, but it started out as Liquid actually possessing Ocelot. By 2014, Ocelot had convinced himself that he was Liquid but Liquid's true persona had disappeared along with his arm.