ok I finally watched the episode.
I really don't think that Glenn died. They gave the impression sure, they even threw in some dramatic music. But some directors love playing tricks on people. We never actually see who the zombies are tearing apart, but we do see whatshisname in front of Glenn as they fell.
No,
When and if Glenn actually dies, it will be in front of Maggie so they can milk as much drama out of his death as they can. Yeah I might be wrong, but the picture of him with Jesus is proof enough for me. You might think the show will jump the shark if he is still alive, but some people think it jumped the shark two seasons ago. It is what it is.