I had a small one like yours. It never really did get much larger than maybe a 10-12 week old dp, she went towards making stock. She also had the same look as the other cornish x, wide stance lack of feathering. And boy did she eat. She may not have always gotten her share of FF but she was a very good forager! She always had a full crop!
And they have wonderful personalities if given a chance at free ranging and not just sitting at the feeder. Mine ran and flew everywhere over my 2 acres and back in the neighbors field. They loved their time here. They would greet guests that came over to the house. We had to put some scratch down just so the guests could leave lol. They were as bad as the turkeys as far as the greeting of people went lol. Just normal everyday friendly chickens! My house sits a little ways off of a busy highway, and when peoples cars broke down out front, we would have to go and coral the meaties as they would go up to the people and expect food and attention lol. I loved having the cornish x, will be getting more soon, I'm thinking!
Enjoy yours, they are a lot of fun!
Deb
edited to add: I had mine processed and 13 weeks and fed FF and free ranged the whole 13 weeks
That has got to be frightening! Your car breaks down and this sea of hungry chickens comes running at you