Who was the first pro football player to lead in punt and kickoff averages in the same season?

Answer 1

In all of American professional football, that was Chuck Fenenbock of the 1946 Los Angeles Dons of the All American Football Conference (AAFC). He averaged 28.7 yards on kickoff returns and 18.7 yards on punt returns.

In the American Football League, that was Bill Thompson of the 1969 Denver Broncos with a 28.5 yard kickoff return average and a 11.5 yard punt return average.

In the National Football League, that was Mel Gray of the 1991 Detroit Lions with a 25.8 yard average on kickoff returns and a 15.4 yard average on punt returns.