If your create a historical season starting in 1968 the ratings are going to be based on the players' 1968 stats (or 3-year, 5-year stats if you have those options chosen).
Recalc doesn't ever get involved until the change from one season to the next. So, disabling it is telling the game that as you roll over to 1969 you do not want to apply the real stats to existing players (rookies would still be generated initially using their real stats).
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