[Intermernet]

Also, although it's not proof, the simple "follow the money" principle should hint at the truth here. I can't see what 2 engineers would gain from putting so much time and effort into independently creating "defeat devices". In comparison, VW had a lot to gain from fudging the figures (if they hadn't been caught).

If I were an engineer at VW I'd be hunting for a new job right now. The company seems to have no problems pinning systemic failure on individual scapegoats, and I wouldn't want to hang around to be caught in the next round of ritual sacrifice.