The people will tell you that the Pro Football Hall of Fame voters will not select two middle linebackers to reach the Hall on the 1st ballot in the same season, and based strictly on history, the people aren’t wrong. It’s never happened at linebacker and happens rarely at other positions.
And by “rarely,” I mean twice actually and six times liberally. QBs Troy Aikman and Warren Moon were 1st balloters in 2006, following fellow field generals Dan Marino and Steve Young in 2005.
Additionally, players at offensive line (Larry Allen and Johnathan Ogden in 2013, Jim Langer and Gene Upshaw in 1987), defensive line (Deacon Jones and Bob Lilly in 1980), and running back (Ollie Matson at halfback and Jim Brown at fullback in 1972) have all made it in together on the 1st ballot.