No, he means that watching a corpse sink into the ground is unrealistic and a bit silly. Bodies don't disappear and if you cut somebody up there should probably be a huge mess where you did so. Giving players the ability to relocate corpses and unconscious players by dragging or carrying would let players hide evidence (though the evidence currently isn't in-game). You could also move an injured teammate that's been shot unconscious in a line of fire, behind cover. Murderers would have a field day with this and stuff corpses into a room, inviting people in only to kill them next. Trail of bodies, etc.