I always thought that the naming of David and Walter was ingenious for its own reason (not the debunked "named after the producers" theory); that reason being that David is following the alphabetical naming order of the Alien series and Walter is the opposite to David, yet they are brothers, so David is 4 letters into the alphabet and Walter being the opposite to David, is 4 letters away from the end of the alphabet. Polar but symmetrical opposites.