I loved that moment wen the manga guys saw Kenji and were all like "now that's a hero!" and then Kenji falls off the bike. Urasawa is really playing with the tradition perception of a hero here. He really likes to break all the hero tropes with his every man protagonist.
So ... What I am somewhat surprised about is how there has still been no real explanation as to who friend actually is (although, if my guess is correct, the room from which the robot is being controlled is the house in which the other friend used to live).