Because it's how many seasons a player ALREADY has played. If it's the player's first season, they are categorized a "rookie" or "R" because they have not yet played a season.
If it's the player's second season, they have ONE year of experience, the previous "rookie" season.
They don't count the rookie season as 1 because especially going into the season when no games have yet been played, rookies have not played a season yet.

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