I don't know if this is the roster set or the game engine, or bumping up stuff ratings for relievers. But, there are too many relievers that are striking out more than 9 per inning. In fact, the league's k/9 rate for bullpens is always above 9, with the provided rosters.
In reality, it looks like it is about 8 or so, according to fangraphs the last few years.
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