And you still wouldn't win a championship. Hire a new HC and the same issues will still exist regardless of scheme. He may get some better under the coaches you listed but not to a championship level.
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Remember when Moon went to the Vikings and fans were saying now that he's got better coaching the Vikings are going to win a SB? It didn't happen and it won't happen for DW4 either.
Not necessarily.
(EVEN IF) Watson has the problem some of ya proclaim, a WCO incorpotated with a wide zone running scheme would have at least half the number of plays to one side of the field. And on those bootlegs (which OB tried to scheme poorly), his cannon of an arm would be better than Schaub or Keenum) if a throw all the way to the back side is required (see Andre Johnson).
In the red zone, they need a big body receiver like AJ or Hopkins for the fade or a quick slant.
A RPO pass in the middle always work.
A roll out will work great in the red zone, too - with minimum read required.
Then you can install a subset of the pistol similat to what Kubiak did for Keenum or Harbaugh did for Lamar.
Easy.