[BobK]

"We talk often about the demands of learning the playbook, but that's usually for quarterbacks."

Not true at all as explained beautifully on another site by a players parent.  Said player is not a QB.

Name a very good Running back who switched to RB from WR after age 21?  Pro or College. 

[BobK]

"We talk often about the demands of learning the playbook, but that's usually for quarterbacks."

Not true at all as explained beautifully on another site by a players parent.  Said player is not a QB.

Name a very good Running back who switched to RB from WR after age 21?  Pro or College.