"Nothing is impossible to hide," he tells him with a bit of a shrug. His sister had been hidden from authority figures on the Ark for 16 years of her life. If Octavia could be hidden, then so could a twin. It wasn't really all that hard to do.
He watches him a bit more before giving a half smile," It's a good thing that you carry yourself differently than him. Means others will be able to tell the difference too if they meet you."