It seems very obvious to me. A "rookie" card is a card from the player's rookie season, no more or less. For that reason, not every player in a respective sport has a "rookie" card.
1951 Bowman Mantle? Rookie Card
1952 Topps Mantle? Not a rookie card
1979-80 Topps Wayne Gretzky? Rookie card
1981 Donruss Golf Jack Niklaus? Don't make me laugh
1986-87 Fleer Michael Jordan? Not a rookie card.
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