You need to at least brace it if not boot it to allow it to heal, but I agree that you need to keep it moving during that process as well. If you simply don't rest it at all, you run the risk of cartilage damage/erosion and arthritis far sooner than someone should have, which would kill the career of a basketball player. If it's a serious normal roll, you need to ease back into it so that it allows the ligaments to heal while the gradual PT will minimize scar tissue.