Honestly, I really think it depends on the area. You are not going to probably have, (depending on where you live), birds that are completely safe from predator. Just think, the wild jungle fowl, Wild pheasant, Wild grouse and Wild turkey all get taken every year by simple North American predators. Them being aggressive may help, but not too much.I would consider adding in some broody breed because often when you crossbreed, many of the birds, or most, aren’t broody. JG and FR don’t really go broody often, though asil does, you won’t get reliable eggs. Some VERY reliable Breeds are :OEGB,MGB, AGB, Crossbreed bantam, (yes, my bantams always live longest and are the some of the most aggressive of my breeds, they are usually broody both spring and fall too!), Egyptian fayoumi, any gamefowl or junglefowl, especially jungle and Saipan and aseel and Malay and shamo. Many generations mixes, I had a 6 gen hen that slept 35 feet in a tree, no kidding, three times as tall as the roof of the coop, she could fly al the way from that tree to the barn roof, 40 feet away. Mix of BO,BR,Bantam!Silkie, EE, Jungle fowl, leghorn, some other stuff.... another reliable sufficient breed is The Icelandic or the leghorn or the campine.