This was Muad'Dib's achievement: He saw the subliminal reservoir of each individual as an unconscious bank of memories going back to the primal cell of our common genesis!  
No, Ajax had joined the team for the sheer challenge of it. Early on, when Tlaloc had made plans with his fellow conspirators, seductive Juno had recruited Ajax to their cause. A tough and aggressive fighter, Ajax had provided the muscle the Titans needed -- not just physical strength, but the mindset of a warrior, a relentless conqueror. Following the initial overthrow of the humans, he had done his best to maintain order, regardless of the cost in the blood of noncombatants.