SB Nation's Minor League Ball has gone back and did a review of their preseason top 50 rankings.
They had RHP Aaron Crow as the 42nd best pitching prospect coming in.
42) Aaron Crow, RHP, Royals: 5.66 ERA with 90/59 K/BB in 119 innings in Double-A, 130 hits. Sent back to High-A, remained shaky with 5.93 ERA, 51 hits in 44 innings, but a 53/9 K/BB. Showed good stuff but feel for pitching was less than expected.
Being sent back down is never a good sign and you don't hear a whole lot about him anymore.