Hader's numbers are wrong. You aren't including last season's numbers, but this trade is a win for the Brewers. We ended up getting Gasser, Contreras, Payamps, And Yeager for 1 year and 2 months of Hader, a 3 out RP. Gasser had some early season command issues but has been incredible over the last 6-7 starts. Contreras is a well above average catcher with 5 years of control. Payamps has been a very dependable high leverage RP with 3 years of control. Yeager is a minor league RP who has intriguing stuff.
Did the trade have some locker room impact last season? Yes, but I am still hesitant to say it's the reason we missed the playoffs considering we played basically the same level baseball from June 1st to the end of the season.
Our high leverage bullpen has been the best in baseball this season. Leads in WPA. 1st in SD:MD ratio.