Five RBs have rushed for 337 total yards or fewer in their first three years, and rushed for over 3,000 yards the rest of their career.
J.D. Smith, Rocky Bleier, Preston Pearson, Don Calhoun and Reuben Droughns. Notably, none besides Droughns began their career in the last 30 years.
Running backs with fewer than 1,000 rushing yards in their first three seasons and over 4,000 rushing yards the rest of their careers:
J.D. Smith, Bill Brown, Dorsey Levens, Joe Morris, Stephen Davis, Mike Pruitt, Clem Daniels and Tiki Barber.
Of course, few, if any, of those RBs were stuck behind a talent like Rudi Johnson. Maybe Perry can be the next Dorsey Levens, who was stuck behind Edgar Bennett for a few years (who was not as good as Johnson). Stephen Davis was behind Terry Allen as well, who was not as consistently effective as Johnson.