*Major, utterly devastating The Walking Dead spoilers below*
With the Jon Snow Effect™ playing a key role in a lot of discussions people are having about how beloved TWD character Glenn might not be dead, I'm going to come with the real, admittedly difficult to cope with, facts. These are four reasons Glenn is probably dead, and how the only way we might see him going forward is as a walker (but how that is also fairly unlikely too, as you'll see).
So without further ado, take a look at the brutal truth that Glenn is dead and gone.
1. He fell into a horde of walkers
The first obvious fact is that Glenn fell into a horde of walkers, and whether you like it or not, it's pretty much impossible to come back from that.
2. 'Thank You' was the chaotically proper send-off episode, with the titular phrase uttered right as Glenn was sent to his permanent death
They made a big deal about this episode, titling it with a line of dialogue ("thank you") uttered by Nicholas before he clearly commits suicide and somewhat checks out right before Glenn is attacked and bombarded by walkers. The "thank you" felt even more like a breaking of the fourth wall than just a word between two survivors.