Special revelation is also remedial , countering the effects of sin on the understanding and conveying truths necessary for salvation. But it is not only that. God had revealed Himself personally to Adam and Eve prior to the Fall. Then and now, the main purpose of special revelation is relational. God entered into covenants with Noah, Abraham and Israel.
Covenants are between persons.
Job, the prophets, the disciples. This entails an anthropic form of revelation that we can understand. But apparently Jesus carried no visible sign of distinctiveness. Most persons took him for an ordinary, average human being, the son of Joseph the carpenter. He came as a human, not an angel or a being clearly recognizable as a god.