Do the "Quinton vs. Kaito Tenjo" video. In the end, Kaito has two lines for Quinton. Something about him wanting to reach Quinton's level and being a student who surpasses his master.
While he does, Quattro doesn't actually say anything back to him. He like Atem saying "I win!" when most his friends try talking to him. Now Trey and even Kite respond to him and that's all the lines i know he has so far.
