One of those wins he was losing and had to be rescued, so he's really 4-2.  The Broncos were 28th in the league for points for the 6 games that Oz played the full game.  You probably also remember that Brock couldn't pick up a first down 3 times that would have put the game away against the 6-10 Bears and it took a knockdown pass on the 2 pt conversion by the D to win that game, you probably also remember the one score in 5 straight qtrs against the 28th ranked Chargers D over 2 games.
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Oz should get major props for 1 qtr against NE and the 2nd half against the Bengals.  He also had a solid first half against the Chargers in the fist game (won) and a great first half against the Steelers (lost because of a terrible 2nd half).  So he basically had 7 good quarters out of the 28 he played.
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Do you really think that's going to be anywhere good enough to help the Broncos win if called upon with this team?