You’re suggesting trading a top 100 SP prospect by Baseball America for a RP who has had mixed results in his MLB career and a good season this year. You’re comparing it to a trade where the Yankees got a RP with an extra year of service time and gave up a weaker prospect at the time. Then you suggest the Brewers should give up a 21 year old who has been one of the best SP in AA this season for a 2 month rental RP.
These hypotheticals to me just show a significant misunderstanding of the Brewers roster and minor league system.
Burnes, Woodruff, Lauer, Houser, and Miley are all set to be FA in the next 18 months and the Brewers are relatively thin on SP prospects in the upper levels of the minors. Suggesting the Brewers trade their 2 closest to the MLB SP prospects for RP is just a huge red flag not understanding the entire picture of the Brewers system.
Meanwhile their top 6 bullpen arms are all Pre-Arb or Arb-1 this season meaning they are still affordable for at least another season.