Detroit is a run first team, so I imagine that's why Barely lined it up that way. Also we jumped on them early and took away the ability/desire to settle for 6 yards a run over and over. They still had success running the ball, they just happened to be behind most of the game and our D was playing with some good aggression.
As to point 2, I think its the same offense we have been running, we just did it better. Pretty good run/pass splits. Nothing dramatically different. Its just a bunch of young skill position players learning to play together and improving across the board. And I agree with your last 2 points 100%