Howdy. I am 68 years old and raising my first chickens. I have 20 Rhode Island Reds. I am saving 5 for eggs and butchering the others. There is variation in size. Some are 1/3 to 1/4 bigger than the others. 12 weeks old. I thought “save 5 big ones” because I felt they would lay more eggs. My wife says “save the smaller ones because they will grow bigger.” (Then get bigger chickens in the freezer). Any thoughts on this?