Getty The Phillies face new rotation questions. The Philadelphia Phillies’ pitching depth took another hit when 6-foot-6 right-hander Gunner Mayer elected free agency and signed a minor-league contract with an American League club, amid fresh questions about how Philadelphia will fit out its starting rotation and complete its bullpen mix. The Seattle Mariners signed Mayer as a free agent last week, according to the official MLB transactions ledger . While Mayer’s future as a major leaguer