Hello Chris.
I have some experience with nagyi, – and I think what happens is that all of the fish are just maturing.
When the male is getting mature, and ready to find a female, – it is natural for him to turn more dark and ‘dress up’ as you call it. It is also natural for him to chase the female, sometimes it may appear ‘agressive’ but in this way it will help the female to also mature and become ready to produce eggs. With nagyi I find this proces very fasinating and not too hard, – the males are often very eager to inspire the female, but doesnt get really ‘rough’. And the proces is natural, I am sure the female prefers the stronger male, but of course she will try to run away a little.
The less mature male, – is likely to remain less dominant as long as there another stronger male present. If the tank is big enough its not a problem, – in smaller tanks it also happens sometimes, and you can find a less dominant male that spends his whole life in the back of tank and you think he must have died, – but he is still there, he just hides very good. The dominant male of course will also show his ‘aggression’, – you would then notice a more dark/greyish colour. But I would not worry about any of the fish being hurt, paros are not agressive like that, (even they look like it :)) ..
If you were to take one of the males out, I would definitely take the less mature male. I think it may be that the female is not yet mature enough to produce eggs, – so she avoids it. But being ‘pushed’ a little will make her mature quicker.
🙂 .. well, well … long story, hope you understand my fish-logic