While the anticipation for Lance McCullers to make his Houston Astros debut, last season was big. He was promoted sooner than most people expected. It would be safe to say that the anticipation for the 2015 Astros minor league pitcher of the year, Joe Musgrove, has been the highest since Roy Oswalt. There were not people clamoring for Dallas Keuchel to make his debut like they have with Musgrove.
Most teams would have had Musgrove up sooner in the season, but the Astros rotation has been relatively consistent this season with Dallas Keuchel, Collin McHugh, Mike Fiers, and Doug Fister have been stable in the rotation, whether they have struggled or not.