"We don't have to all fit in the car. Trouble and Charlie need generic human morphs and will be flying to some population center where they won't be recognized to acquire the component humans. It would be nice to stow Ax and Ethan away with us in small morphs, so we'd have to stop occasionally to let them change out and back again - Ethan might be able to do it in transit, Ax can't - but that doesn't seem like it should be that serious a problem if we drive at night and don't take crowded highways, and if it proves really complicated they can get out and fly."