There are hordes of Oriental-American crosses that come peacomb and are called Roundheads which contain not a drop of the original Allen bloodline. The ubiquitous Boston cock had very strong peacomb genes to give that characteristic to his offspring and descendants for generations to come to this day.
The old time roundheads are most suitable for long heel knife. They are smart, side stepping, an agile heads up fighters, they could fight in the ground and in the air. Roundheads are aggressive, fast fighting, feet out and deadly, sure cutting cocks. They have strong and devastating leg power specially in the first buckle.
The Roundhead has made a comeback of sorts recently as a true threat to any other bloodline after constant infusions and crosses have increased its vitality and fighting prowess. Remember, the Kelso was evolved from this bloodline.