Rainer Werner Fassbinder ... Director?
I've seen and admired Tenderness of the Wolves several times and don't believe for an instant that it was directed by Ulli Lommel. I think Rainer Werner Fassbinder is entirely responsible this masterful film, which has Fassbinder's personal stamp all over it.
Not only is Fassbinder in the cast, but the film was made with his crew. And compare the film's style with that of Querelle.
Why Fassbinder would credit another director is a mystery, but these things do happen: think Howard Hawks and Christian Nyby (The Thing from Another World), Steven Spielberg and Tobe Hooper (Poltergeist), etc.
It would be a crime if Tenderness of the Wolves were to foster the illusion that Lommel is or ever was any kind of an artist -- even an anti-artist. I can't speak for his other German films, but Lommel has never shown the remotest sign of this kind of talent in any of his American films. Early on in the U.S. he made a couple of mediocre horror films with a modicum of visual style (The Boogeyman and The Devonsville Terror), then participated in one of the authentically worst sequels ever (Boogeyman II). Subsequently Lommel has crapped out any number of worthless direct-to-video which exist solely by means of their crassly sensational subject matter and fail even to deliver on the level of Z-exploitation trash.
Lord help us all when the Lommel Cult inevitably develops.