You should really check out Ringo's career with the Packers.
NFL football in the 50s/60s doesn't impress me too much
The league was smaller and the money was thin - closer to semi-pro than later NFL.
Players back then often had real jobs off-season.
Defensive players in particular were seen as inferior to offensive stars.
Watch old clips and see that guys were often slow clodhoppers.
Linemen were bouncers and construction etc workers off-season.
Even Jim Brown had a job
Jim Brown ran through those old, slow defenses like poop through a goose.
Franco would have run over them as well
They weren't that big either - Franco was same weight as Ringo and an inch taller.
I consider OL the most important unit for a team to have but cant see a olde tyme center as greater than Franco (and Mike Webster is placed ahead of Ringo in center rankings)
Remember when ... off-season was work time for the Cleveland Browns (and all pro athletes)?
Long before NFL players were multi-million-dollar men, off-season meant working a "real" job.
www.cleveland.com