Like you I am still learning about the two roo dynamics. I can share what I see though as it seems similar to the behavior you are seeing.
My two boys get on with one another. They work in tandem when out to free range it’s amazing to see honestly. The only time I see chasing, like you described, is when the Jr roo (Story) gets to rough or the head honcho (Lore) thinks he is bothering or upsetting the hens. All he does though is chase him away a bit. No one gets anything other than their feelings hurt.
Perhaps this is what is happening and Mr P is simply teaching the younger Roo. I hope so!
