Well, considering that Maroney missed practice Wednesday, was limited on Thursday and Friday, and is listed as questionable on the injury report; I don't know how they nailed it. If Maroney practiced all week and was not on the injury report, then they would have nailed it. He isn't a healthy scratch.
This is football. Healthy enough for the bulk of carries in preseason game 4, and healthy enough to practice last week, means healthy enough for regular season game one.
BB plays an injured player in the most meaningless preseason game (4) and then practices him again last week, but he's too injured to play? Sorry, not buying it.