Why would that be? Brewers team ERA. 2015 - 4.28 - Before Johnson 2016 - 4.08 2017 - 4.00 2018 - 3.73 2019 - 5.18 - After Johnson Reds team ERA. 2015 - 4.33 2016 - 4.91 2017 - 5.17 2018 - 4.63 2019 - 3.27 With Johnson The guy is one of the top 5 pitching coaches in baseball and we let him leave.