Gimp said:needsize DOES not train with 5x5.
Maybe not at the moment, but he used to. Anyway, that was just an example. How about another one? That one guy, Dave whatever his name, the powerlifter who dieted down and looked bigger than most bodybuilders. Rememer him? Yeah, guess how he trains.
"Symmetry" is more about genetics than it is about training, as long as you are hitting the whole body anyway. Only people who train retarded (like only doing upper body, never hitting legs) really can negatively impact their symmetry through training.