I had a chick recovering from a pretty extreme injury — full-on scalping, all the way down her back, with exposed bone and muscle tissue. She was about 8 or 9 weeks old at the time (someone will probably correct me on the exact age). During her recovery, she was hanging out on the sofa — when I turned my back for a second, and she somehow squared off with one of my parrots… who was more than twice her size.
Now, my parrots grew up around all kinds of rescue birds. They
know not to mess with the little ones.
But no mini bird had ever stood their ground like that- and then charged!!!
— let alone a half-healed chicken when my parrot was just minding its own business.
They didn’t retaliate. They just… flew away. And then hid. Now when Ouzo comes in the house, they fly away- 'Im not messing with that silver devil'.
I swear, they came out of that moment changed.

Now the parrot watches- confused= as it is okay for a Dove to eat the chicken food? but not a big parrot sitting on the chaise minding their own business.
No surprise that your chick is staking claim to something... I know I have a few that do... hehe