Dallas Keuchel, for all intents and purposes, had a rough 2016 season. He is also at the center of the Astros rotation debate. And it was because of his 2016 season leads some to doubt that he could return to his best form.
There is merit behind that thought as Keuchel relies on pitching low in the zone while not possessing overwhelming velocity. Last season, we witnessed his velocity drop and the strike zone not as generous to Keuchel as in years past. Combine all these factors to a bum shoulder, and it easy to see why he struggled.