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Everything you describe is normal behavior of active, healthy confident chicks. If you've only had something like Silkies, you may not be used to very dominant behavior in a chick group. Just because they peck at things like your ear does not mean they are aggressive! That is not aggression. Comparing normal pecking order behavior to aggression toward humans is apples and oranges.
They are active and curious, they are intelligent. Golly, you'd be screaming and running for the hills if you had Delaware chicks. They are the mouthiest chicks I've ever had-I bred them for awhile, but I'm down to an elderly pair now, the sweetest friendliest rooster you could ever imagine. However, as chicks, they bite and they bite hard. They explore everything with their beaks and I do mean everything. That is just the way they are. They are NOT aggressive. They are friendly birds, overly friendly. My Delaware hen will run up and butt your legs with her chest if she wants to be picked up and if you don't do it, she'll bite the fire out of you, grabbing your pants along with skin. She isn't aggressive, she's friendly to the point of being a nuisance.
No one here was aggressive in answering you, IMO. I was just wondering how anyone would be having aggression trouble from a 3 week old chick enough to dismiss an entire breed. It did not make sense to me. If Barred Rocks were aggressive toward humans as a breed, they would not be my favorite. My BR hens are friendly. My hatchery ones were wonderful. My hatchery BR rooster was friendly. My old line heritage BR hens are friendly. In their flock dynamic, two are pushy, two are middle of the road, but I would consider none of them aggressive toward humans. If one is aggressive to humans when the hormones kick in around breeding age and it isn't quashed by a few sessions of "aversion therapy", you cull that bird. You don't pass on aggressive genes. Simple as that. But, no chick of any breed can be judged for anything at less than a month old.
Just know that chickens do not react to small children the same way they react to adults. Kids are loud, have jerky sudden movements and are not much taller than a large fowl rooster. Roosters especially are nervous around small kids, generally. My super sweet, loves-to-swing-in-the-hammock-with-us Delaware rooster becomes visibly nervous when he hears kids screaming and playing in the neighborhood. It's normal. I would not allow a small kid in the pen with him simply because of that.