i always wanted to create an all spy team for these fun leagues. it would be interesting as to how close the matches would be
most likely wouldn't win much, but it would be one hell of a good time on that team haha
defense: Run 1-2 spies at all times. with either the occasional offswitch soldier/demoman/engy depending on the flag & map situation. or hell just make him a 3rd spy.
offense: 1-2 spies at all times with a full time scout for touches and major flag movement.