And just to put my two cents in for historical reference, I think this is a great discussion. I think Crochet has the higher ceiling, being a lefty who has recently reached another gear. I think there is no doubt Kelley has the higher floor. Don't forget that Crochet was a pretty mediocre pitcher as of just one season ago. I know some are saying "reliever floor" or risk, but if he loses whatever he gained before this year, he won't get into the middle minors, let alone the majors. Kelley seems to be almost maxed out, but his max is still a pretty darned good pitcher.
As of today, I would place Crochet SLIGHTLY ahead of Kelley because his ceiling is so high, but it is really close.