Aya's first impression of Brad was everything but good. He thought that Oracle was trying to kidnap him, bit, molest or everything at the same time. Yeah, so MAYBE he was stupid because he hasn't instantly understood why this foreigner will ask him to join his (at the time) one-person, evil-personified group and try to take over the world with their super-natural powers. Maybe. Or maybe Crawford was just asking too bizarre and unexpected questions. That's exactly why he shouldn't have been too surprised when Aya turned in the opposite direction and started running with speed that would be hard to much even for Shuldig.
At that time Crawford decided that maybe he should give Aya a little more time to get used to idea of being his right-hand man. Say, around four years. After all Aya was still eleven.