I'm going with Ominar Synn. Gog was downed by the member of the JSA with the least quantifiable feats, Omynar was only defeated by a plot point in that the Claw or Horus had some strong connection to Carter and Sheira ad it was a part of the Nth metal powering him.
GOL
Golgo13Senior Member
Also, wasn't Onimar Synn only defeated when Adam Strange BFR all his body parts to different parts in the universe?
