Glenn is not dead. IMO, I can't comprehend why this is still being debated.
1.) A main character since S1 has a 10 second death scene? Nah.
1a.) Said main character's entire body wasn't shown being "eaten." It was a clever camera angle to make the G.A. believe Glenn was being devoured.
2.) Glenn was not featured "In Memoriam" on Talking Dead.
3.) Chris Hardwick slipped and def said: "What appeared to be Glenn being ripped to shreds."
4.) Glenn is still being spotted on-set for filming.