Speaking for myself, I was addressing what appeared to be your sentiment, that juror conduct can NEVER be grounds for appeal in a Federal case, and that ONLY judicial error can be grounds for appeal in a Federal case. The cases I cited merely refute that.
You'll note my previous message to you as well, where I said that I doubted juror misconduct would stand as grounds for appeal in Martha Stewart's case. But as Bluntpoint said, the notion can't be dismissed out of hand.