Yeah, as you'll notice, Tony was the boss in the pilot episode. But I think Chase thought differently after the show was picked up. He couldn't have Tony starting out at the top because there would be nowhere for him to go.
Yeah i reckon that was the case also. Starting Jackie off as having cancer and boss was probably the best thing to do.
I would have liked to have seen more flashbacks like the sit down with Uncle Junior and Jackie. Maybe even younger version and showing them busting up Feeches card game.