The old hierarchies were back: Alphas, betas and omegas. But not all people, it was 0.01% who had this peculiarity.

Glenn Rhee was walking with his group: Rick, Daryl, Carl (Rick's son, Maggie, Carol, Michonne (Rick's girlfriend), Eugene and Rosita. When he smelled a delicious aroma, no one in the group other than him noticed it. They walked further finding a small camp with food, everyone assumed that was what Glenn smelled but it wasn't like that. Glenn was an alpha, and no one knew it.