The reason I said the partridges were cockerels is because they have big combs and wattles, and they also have very slight streamers on the back of their heads (sometimes pullets have streamers, but it is most common in cockerels). The reason I said the grey is a cockerel is because it looks like it has slight streamers starting, I did look back at the photos and I’m feeling more unsure about it. If you were to ask me about the grey one now I’d say s/he’s looking more like a pullet. Pullets have smaller combs, and more rounded fluff on their heads. People do say you can tell by posture, but I often don‘t find it very useful.
It sounds like the partridges were fighting to try and see who is the Alpha. As they get towards crowing age this will become more and more common.