The guy revealed all this stuff in voir dire. It was reported before the trial even started. The defense, for whatever reason, didn't want to keep him off the jury. That is no one else's fault but theirs.
Do we know for sure which jurors the defense challenged for cause? If the judge over rules the challenge, the juror is seated, unless the defense uses one of its limited strikes. To my knowledge, we don't know which jurors were challenged for cause.