Matt Garrioch (of MLB Prospect Guide and formerly of MLB Bonus Baby) has put together what, from what I gather, is purely a statistical list naming the top performers in each league based on the numerical factors he believes best correlate to major league success, with some age limits thrown in to eliminate organizational filler. To take out the suspense, a number of Rays did surprisingly well:
Tim Beckham - #11 hitter in IL
Chris Archer - #3 pitcher in IL
Hak Ju Lee - #1 hitter in SL
Ty Morrison - #7 hitter in SL
Kyle Lobstein - #8 pitcher in SL
Jake Hager - #2 hitter in MWL
Plenty of other Rays on the lists as well beyond the link.