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https://theathletic.com/4266660/2023/03/02/cubs-ben-brown-hayden-wesneski/

Positivity, and some stuff/repertoire details, for Brown.  He's said he mostly threw fastball/curve last year, although he's thrown change from younger days.  He and Cubs seem to want more change incorporation.  Also playing with the sweeper as 4th pitch.  Not comfortable with that yet, but he's optimistic.  Article referenced modest tweaks to his fastball delivery; between physical maturation and shortened delivery, suggestion that he's maybe a little-bit faster this year.