I customized this leaderboard trying to get Mason Miller's 50% K rate into its appropriate Edwin Diaz-Felix Bautista context, and danged across 2022-2024 if 2024 Craig Kimbrel isn't right there in the top tier.
https://www.fangraphs.com/leaders/major-league?pos=all&lg=all&type=1&ind=1&stats=rel&team=0&startdate=&enddate=&month=0&season1=2022&season=2024&qual=10&sortcol=7&sortdir=default&pagenum=1
Should OAK move Miller, I think Edwin Diaz-Jarred Kelenic is one decent example from recent seasons what a Bat for Relief star structure might look like.
Well good thing I didn’t say he had great command every time.
That said, he’s not going to have that level of success (and I don’t just means runs allowed) without having good to great command most of the time.