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

Carl Grimes walked with his group, consisting of: Rick (his father), Daryl, Glenn, 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, they all assumed that was what Carl smelled but it wasn't. Carl was an alpha, and no one knew it.