Pretty good hit rate, but having an extra 1st makes up for the loss. I'm more concerned about the draft pool than the pick honestly.
Regardless, we need a closer. I really doubt Kimbrel will still be available in June, and a good closer will likely cost at least a 45 FV prospect come July. It's also unlikely said closer will be as good as CK. So you're going to give up a prospect at least as valuable anyways in a trade for likely a lesser pitcher.
I'd rather just sign CK now and get the added value of having him for 1.5 extra months, assuming he would even be available in June.