Guardian or snitch, depends on the lighting. Mike Fiers, the 34-year-old journeyman pitcher whose two career complete games are also no-hitters, one of those as a Houston Astro, nearly four weeks ago blew the whistle on a technology-driven, sign-stealing scheme allegedly run by those Astros. Major League Baseball has questioned dozens of potential perpetrators, accomplices and witnesses (including Fiers) in an investigation that threatens to expose the finest era in Astros history as, at best, suspicious. Fiers pitched for the Astros for 2 1/2 seasons, the last in 2017, during which, he told The Athletic, the team devised and integrated...