It is odd, that's for sure. I google'd around a bit and found how chickens are the ones who usually pick on the peacocks. Perhaps the peacocks know that the chickens could give them a deadly disease so are simply, kicking them out?
I really don't know much of anything animal-wise, but perhaps animals are finally evolving to another level of intelligence.
So my opinion is, it looks like they just want to take back their land? Perhaps those were the warrior peacocks