If Glen is alive I wonder if the producers go "Kenny" route( Kenny from TWD game season 2 appearance), Carole, or Darrel type moment for Glen to show up to save the day later in the show. They said they wanted a Kenny season 1 from game death in show at some point. A Glen assumed death would be very similar to what they hinted too. Scenario in which no where to go and a idiot being eaten allows him to escape.