It's more complicated than you might think. Your young cockerel has suddenly begun to see his world and the people in it differently and it confuses him and makes him nervous. Both his age and the approach of spring have triggered his hormones, and this has caused a personality change.
If that doesn't seem complicated enough, your wife's behavior is also a factor in this cockerel's behavior. Something about the way she carries herself, probably with hesitancy and not much self confidence when she's near this cockerel, or sudden, jerky moves when she's in close proximity to him can set him off and cause mistrust on his part.
Also, if you have ever been around a pregnant woman, you will understand how hormones can cause unusual reactions to stimuli all on their own. It could be that she wore a new or different pair of shoes or pants or a hat that caused him to feel he was in peril and needed to defend himself. Yes, a pair of shoes will do it.
I told you it was complicated. That's why most people say the hell with it and just eat him.