Cousineau was drafted first overall in the 1979 NFL Draft by the Buffalo Bills, who acquired the pick as a part of a package of five draft picks from the San Francisco 49ers in a 1978 trade for O.J. Simpson. However, he never played a game for the Bills. He instead signed with the Canadian Football League Montreal Alouettes, who signed him for double the money originally offered by the Bills. Cousineau became a star for the Alouettes, becoming the Grey Cup Most Valuable Player in the 1979 season. He only played in four games in his third season because of an elbow injury while the Alouettes collapsed.  In 1982, Cousineau wanted to return to the NFL, choosing to forego two optional years with the Alouettes. The Houston Oilers attempted to sign him, but the Bills (who still held Cousineau's NFL rights) matched the offer. Cleveland Browns owner Art Modell had long been interested in signing him. Cousineau was then traded from the Bills to the Cleveland Browns for a first-round draft choice (14th overall) in the 1983 NFL Draft, plus a second and a third draft choice in subsequent years. That first-round pick was used on future Hall of Fame quarterback Jim Kelly. Cousineau signed a five-year contract for $2.5 million, the highest contract ever at the time by the Browns.  In 1983, Cousineau was arrested in connection with minor collision with a police car on Saint Patrick's Day  He was charged with drunk driving, improperly using traffic lanes, and not having his driver's license. He was subsequently found not guilty of the drunk driving charge, but guilty of the moving violation (the driver's license charge was dropped).  During Cousineau's four seasons with the Browns, he led the team in tackles for three seasons. He was named a 2nd-team All-NFL by the NEA in 1983, and by the AP in 1984, but never made the Pro Bowl in his career. He was considered an overpaid disappointment in Cleveland, while Bills fans fondly remember the fact that the man who once snubbed them for the CFL was traded for Jim Kelly. Cousineau signed with the San Francisco 49ers as a free agent after the 1985 season where he played two years as a reserve before retiring in 1987. Cousineau finished his NFL career with ten interceptions and 6.5 career sacks.

Answer this question "What position did he play for the Buffalo Bills?" by extracting the answer from the text above.
he never played a game for the Bills. He instead signed with the Canadian Football League Montreal Alouettes,