Down right stupid to even think about trading Kimbrel.
Yeah, I get that teams overvalue most closers, but Craig Kimbrel isn't most closers. If he remains anywhere near as dominant as has been the Braves would be crazy to trade him anytime soon. Even if/when his K/Rate declines he has lowered his walk rate every season since the joining the Braves system.
For every dominant closer you find (Smoltz, Rocker, Kimbrel), there are pitchers that don't work out in the closer role, such as Kolb and Reisthma.