Gamma 1 and Gamma 2 should have tails. It would be an advantage in fighting, as it could be used to do more damage to the opponent. Plus, since they're supposed to be super heroes, the tail could help them swim faster if they need to swim. It would only be a disadvantage for them if the opponent could easily avoid the tail in fights and use it to throw the Gammas across the battlefield. However, I highly doubt this is possible if the fight takes place on the ground, as the Gammas seem to be made of a heavy metal (for example, steel), which would make it practically impossible to even lift them.