The Problem With the Whole "Disguise" Theory
Some fans of the show have pointed out that Glenn has previously covered himself in blood to throw off his scent, making it impossible for the walkers to detect him. The argument follows that perhaps the same thing happens when the intestines — believed to belong to Nicholas — drench Glenn in blood. Sadly, the issue is that Glenn used walker guts all those episodes ago, making him seem like just another walker. But this is real blood from a living (well, dying) human. It's oxygenated, it's life blood. If anything, the walkers would be more attracted to Glenn in this case. Sorry, guys.