Forty-plus years later it’s a moment Michigan State’s 1972 football team can celebrate despite an otherwise underachieving season that turned out to be their College Hall of Fame coach’s final season. The Spartans finished with a 5-5-1 record, but when the record had slipped to 2-4-1, Duffy Daugherty announced the night before facing Purdue he would retire at the end of what was his 19th season. Michigan State responded with a 22-12 win. Then, the Spartans made it two…