What a sweet story about your monogamous chicken pair!We once purchase a pair of silkies and integrated them onto a flock of hens and one rooster.
The silkie pair stuck together, the silkie rooster took absolutely no interest in any of the other hens and the silkie hen would boss our other rooster around so he would never bother her.
When the silkie hen went broody, the silkie rooster stayed with her the ENTIRE time, they would actually sit on the egg together.
The egg hatched and the were the best parents ever, they cared so well for it.
To me it truly was like they were married and had a little family! They were such an interesting and unique family. I had never seen anything like them before!