It should be mentioned that Kimbrell was a 3.3 win player in 2017. It hasn't been five years.
his issue seems maybe to have been a lost of fastball command last year more than anything else. Overall, he just wasn't as good in the second half, but that's a fairly small sample for a reliever.
1.2 and 1.5 before that. Seems that's more his baseline these days.