Power surmises that he became numerous figures from history, myth, and legend, and the Nine bred Lord Grandrith specifically to live out the destiny as foretold by The Undying God, which was, of course, the story of Tarzan himself. He also claims that Lord Grandrith was the individual who did some of the deeds and participated in the adventures of "Tarzan", when these adventures clash too greatly with established Wold Newton continuity.
Power surmises that he became numerous archetypes from history, myth, and legend, and the Nine created Lord Grandrith specifically to realize the destiny as foretold by The Undying God, which was, of course, the narrative of Tarzan himself. He also claims that Lord Grandrith was the individual who carried out some of the deeds and participated in the exploits of "Tarzan", when these exploits conflicted too greatly with established Wold Newton continuity.