I don't know if the official unofficial mgoblog 2 deep has been updated to reflect this (would check if I wasn't on my phone), but I think van Bergen is at SDE and Heininger is at DT. I've been confused about it for a while but one of the pressers this week confirmed it.
“The player development is the main thing I like (about Michigan),” Williams said. “You can see that they develop their players. They get them in the gym and they work them hard. And their hard work pays off.”