Sgt mentioned Vettels Torro Rosso win, so thought you may also have been looking at just race wins. You're right all Schuey's titles were Byrne cars.
yay!! Easy one. What is unique about one of these champions multiple championships. Champion! please log in to view this image please log in to view this image please log in to view this image
Niki Lauda: Only driver out of the 3 to win with only 2 different engines, Ferrari (S12) and TAG (V6t)