IMO, one and two are spot on. I often talk with my dad about the Bears and the ups and downs of it all. What always galvanized me, is that he and I see the game exactly the same. It's kinda freaky.
To your point of basing an offense, rings the loudest bell. Pops and I are of the opinion, that offensive football is a symphony. It must have a tempo set by the conductor, which is Justin. In football, being on time is the most critical component of every offense. Snap count, ball fake, line assignments and routes must be at a precise place and time. For the main piece of the puzzle to be out of sync, that has to be a nightmare for an OC. The clock is ticking.