By Evan Bleier When the Indianapolis Colts moved on from franchise quarterback Peyton Manning after he missed a season with a neck injury, they thought they’d found his heir apparent in Andrew Luck. For a while, despite putting Luck behind a suspect offensive line, it seemed Indy might have found their next QB. Then Luck, who constantly battled injuries during his NFL career, abruptly retired at 29, sending the Colts back out searching for their next signal-caller. First came Jacoby Brissett, a career backup who is better suited to a secondary role. Two seasons ago the Colts went with Philip R…