It’s no secret that the outlook of the Mets rotation has changed since the Aug. 1 trade deadline. What was once built around the foundation of two Hall of Fame starting pitchers — Justin Verlander and Max Scherzer — has quickly turned short on options. Despite the perception of lacking depth for a consistent rotation, manager Buck Showalter is confident in the options within the organization, including southpaw David Peterson, who took the ball Wednesday night against the Chicago Cubs. “I hear some of the sarcasm ‘If not them, than who [will start]?,” said Showalter.