For those that are innocent until proven guilty, the black box tells all.
As for the kids being thrown out of the car because they weren't buckled, no competent lawyer will go in front of a jury and say, "Well, it's really the parents fault for the kids being killed."
You would **** a jury off in that situation. Because what would the prosecutor say? "The defense wants to insult your intelligence and tell you that a big time football player deserves a pass because of his reckless behavior, so he blames the parents of the kids. May I remind you who caused the accident in the first place?"
Guy is gonna get a plea deal down to 3-5, probably out in 2 or so. Dead people are involved. There was that idiot truck driver that tried to do a illegal u-turn on the turnpike, he's probably looking at 3-5 years.