It must’ve been a tough pill to swallow for Nick Dell’Osso last February. Three months ago, the CEO of Okla. City-based Expand Energy, who led the company to become the nation’s largest natural gas producer, faced a board decision to relocate headquarter operations and top-level executives to Houston. After 17 years with Expand (previously Chesapeake Energy) and less than six years in the pilot seat where he navigated the merger of Chesapeake and Southwestern Energy, Dell’Osso decided to wave goodbye. ...