LAS VEGAS — Hours after his signing with the Chicago Bulls became official, Norman Powell strolled down the Thomas & Mack Center sidelines to greet a handful of his new teammates, several of them for the first time.He sat with them, overhearing the conversations between 20-somethings and watching a 19-year-old Caleb Wilson drop 35 points in his NBA Summer League debut. Powell, 33, was reminded of his responsibilities in joining Chicago’s young core.“I think I’m the only 30-year-old on the team,” Powell said Saturday. “So, just help them, guide them, give them as much knowledge that I’ve received over the years through vets that I’ve had. Just helping them focus on the details of their game and how we can improve and play winning basketball every single night, and then off the court, helping them navigate life as a professional.”Caleb Wilson getting it done on both ends in NBA Summer League debutPowell, a first-time All-Star last season in Miami, hoped he’d be back with the Heat. Then the Heat made a blockbuster deal that landed them longtime Bucks franchise cornerstone Giannis Antetokounmpo. The books turned tight.“Obviously, it’s a business,” Powell said. “They made their decisions and made their moves, and things happen. It is what it is.”Powell inked a two-year, $45 million deal with the Bulls — a deal Miami seemingly never prioritized nor had room for after altering its outlook — with a team option in his second season. His deal, along with one like Zach Collins’ extension, signal the new regime’s desire for flexibility.