It has been a chaotic few days for David Peterson. From the moment his phone buzzed with a call from Mets president of baseball operations David Stearns late Wednesday night, things have been a whirlwind for the veteran left-hander. Peterson used Thursday to sort through things at home in New York, figuring out what would be coming with him to Chicago after being traded to the Cubs. He had to get to the team’s plane that evening for the trip to Milwaukee. Peterson had to meet new teammates, coaches and staff, and do media. Oh, and there was a start to prepare for on Saturday against the rival Brewers. “The game day has been the easiest one,” Peterson said. “Different jersey, but it’s the same thing.” Peterson arrives at a time when the Cubs are desperate for innings following an absurd pileup of injuries to both the rotation and relief corps. At the same time, Chicago does see him as a bounceback candidate after a season of rough results in New York. It is a change of scenery with a dose of comeback potential, and it came together in Saturday’s 8-2 win over Milwaukee at American Family Field. Well, it came together after the first pitch fit right in with the rest of the recent chaos. Peterson’s introductory fastball for the Cubs veered middle-in to Jackson Chourio, who ambushed the offering in the first inning and sent it sailing out to center field. For a Chicago team searching for anything positive on the pitching front right now, it was a disconcerting moment. “He didn’t back down,” Cubs manager Craig Counsell said. “Not how I wanted to start,” Peterson said. “But give me another ball and we’ll see how it goes. I just stuck to my approach and continued to fill the zone up.” Peterson worked into the sixth inning with his only other setback being a two-batter sequence in the fifth -- Blake Perkins doubled and Sal Frelick singled -- to net the Brewers a second run. Beyond that, the 30-year-old lefty worked efficiently, leading with his fastballs (30% usage for both the sinker and four-seamer) and trusting Chicago’s defense (seven outs via grounders). When Counsell headed out to the hill with two outs in the sixth, the manager patted Peterson on the back multiple times before the lefty walked off to cheers from the Cubs fans occupying American Family Field. Peterson struck out two, issued zero walks and threw just 69 pitches to get to that point. “I’m happy for David. Not an easy thing to do,” Counsell said. “But I think it shows professionalism and some gr
