We know that Rulk is not Samson, Ross, Rick, or Ares. In the end of issue #6, Samson shoots Rick (who had just been A-Bomb) to prevent him from telling Bruce Rulk's identity. Then Ross stands over a downed Rulk and criticizes him. Ares is active in the Avengers and has been making appearances in Incredible Hercules. He is a god. John Ryker is a good call. He did make the Gamma Corps. He could have done it to himself. (And obviously the Rulk was sanctioned by someone in the Government per Ross' dialog at the end of #6. - Nice one.
Yeah, that's the same store. It's called Golden Age Collectables. It's downstairs under the fish market. I didn't know it was still there until your comment inspired me to look them up. I do most of my comic shopping at the Comics Dungeon. In Wallingford (I'm in Fremont.) Cool to know it's still there!