Conversation so far:
What league did Tom Cousineau play in?
Tom Cousineau is an American former college and professional football player who was a linebacker in the Canadian Football League (CFL) and National Football League (NFL).
What position did Tom Cousineau play for the Buffalo Bills?
Tom Cousineau was a linebacker.

Question: Was he a successful player?
Self-contained rewrite: Was Tom Cousineau a successful player?