Forget Kimbrel. The pen is so bad that a bold solution is needed. Kimbrel isn’t a bold solution.
First, identify a team that’s going nowhere but has three solid relief pitchers and trade for them. Might have to give a solid prospect or two but do it.
Then pick out the three of the existing relievers (other than Doolittle) most likely to improve, and dump the rest. Just dump them. Rosenthal might be one of those three; send him down (as we've discussed) for three weeks to get his mechanics straightened out.
Finally, there are a few relievers at Fresno pitching well. Bring two of them up.
This plan might work and it might not. But it is, in total, rather drastic, and would at least show that Rizzo is concerned. I’m tired of hearing him say “it’s only 12 games, the pen will be fine”. The pen will not be fine as is.