I agree with the middle leader thing and my sheep also come to me for security when the rabbit men are are in the field to reduce the bunny population. I deliberately stand in the field so my sheep feel safe and dont keep running about in panic. If the drag hunt goes by I let them out of the roadside field as it passes and they stand with me. Then follow me back in when its passed.
I think the social / leadership / pecking order is complex in all my animal groups and not a simple domino effect. All my most self assured, independent "leader" birds and animals take a middle or center role and are never bolshie or bullying. My horses were the same. Any animal who questioned their position would receive a measured response that reinforced the message. But most of the time the highest ranking go unnoticed.
I have a my own personal theory that as very few animals feed each other beyond weaning as LRR said. Then providing food establishes some form of relationship hierarchy similar to mother and offspring. Im not sure what that arrangement signifies to them. They know that I am not their mum but the calling them and feeding them routine does establish a relationship beyond cupboard love. And perhaps its the calling that establishes this rather than just the food offer, as people that pour food from the back of tractors dont always seem to establish the same rapport.
At the end of the day though I suppose the more time that you spend with them in a calm relaxed manor, reliving the occasional itch, their pain, their hunger and their thirst.Not to mention getting them out of trouble! They've gotta think your pretty great right?