Any way to make this bachelor pad work?

[Sonya9]

When I go to run him back home he’s starting to run at me aggressively with his wing dropped, although he backs off when I stomp at him and shoo him off and chase him.

when I let them out of the pin every morning he does the same thing. So I have to chase and stomp.

The cockerel is likely thinking "the human used to be so nice but now he is constantly threatening, chasing and stomping at me -- I don't know what came over him but he has become dangerous and I need to keep him at a safe distance".

Acting in a threatening manner towards him, especially near "his hen", is what made him aggressive IMO.

 

[Chickenhappy8708]

I would agree, that had a part to play. But when he attacks you, and only when he attacks or comes at you in an aggressive manner should you spread your arms, and walk slowly at him.

 

[Folly's place]

Very rarely do we chase chickens here! Walking with spread arms, or with a stick to extend our arms, sure, but it's herding, a'la Dr. Grandin, not a mad chase.
Look up her book on managing livestock! She's not about chickens, but is right on with advice, and can help with chicken herding too.
Mary