I would add Herschel Walker - don’t think he was ever utilized properly in the NFL, but having seen him run around, through, and over defenses in college, he was truly one of the best backs ever. And Eddie George, who was the workhorse of the Titans offense (more key than Steve McNair in those seasons). He had 400 carries for several seasons in a row, staying healthy despite that incredible workload.
If this was a list of the best NFL Athletes, Rummy, Herschel Walker would be #1 by a mile. And, yes, he was miss-used badly by every NFL team he played for-- Including my Boys by Mr. Tom Landry Himself!
Eddie George was a very good running back but not a great one. He took the Titans to a championship appearance in Super Bowl XXXIV but they lost to the Rams.
Now, Cat, Earl was a great running back if there ever was one but he never played in a Super Bowl even if it can be said it was not his fault as his NFL teams, the Oilers and Saints, were not championship worthy.
As to telling Seven two time Super Bowl Winner Jim Plunkett should be dropped lower... 
you are on your own!
Not only does she pack a wallop... 
she bites as the Borg gave her one mean set of choppers!