I had comp problems in my recent cb match and nobody said that match should be repeatet. Personally I think it shouldn't be cause it would be waste of time. Comp problems are only player fault and everything should be done according to rules (hold or change, nothing more).
gg? Sure when your opponent has comp problems, and match cant be put on hold.
If the match is replayed, as it should be, make sure all the demos are available here.