He he he designed and built long before a Zagi which was a pusher if I remember correctly. Flew a slope soaring wing called a Boomerang long before the Zagi came along. There are only so many configurations in a flying wing that work well. The Zagi like the Boomerang and the Wedgie come from a long line of proven configurations nothing new or innovative except maybe the airfoil and the amount of reflex if any.

Dennis