Rick and Morgan have an understanding of each other but clearly they have changed since they last met in season 3. Rick has become colder, he had to as he's the leader of a big group of survivors and he had to face some psychopaths (The Governor, Terminus people) ; but Morgan has survived all this time by himself, so his perspective about people is different than Rick. Morgan will clearly serve as a new moral compass in the show against Rick this season, and for once Rick might really listen. He respect Morgan