What jersey number did Aaron Donald wear with the Rams?

Which college was J.J. Watt playing for when he entered the NFL? What jersey number did J.J. Watt wear with the Texans? Aaron Donald is best known for playing with which NFL team? Which college was Aaron Donald playing for when he entered the NFL? What position did Dick Butkus primarily play? Which college was Dick Butkus playing for when he entered the NFL? What jersey number did Dick Butkus wear with the Bears? What position did Mike Singletary primarily play?