Great point indeed.
Because the list is so short that I'll go back ten years to 2000 and I hope you aren't put off if I do that, as there have been to my surprise more than I had thought.
Ricky Williams (though an anamolous situation to be fair and now one of the few big backs [230+] since 1970 to feature or star in the NFL since 1970 as discussed separately under the Kenton Keith post in the Tiger-Cats forum)
Peter Warrick (Offseason/Practise Squad Only At Montreal)
R. Jay Soward
Quincy Carter (Same situation as Warrick)
Shaun King (ditto Warrick with Hamilton)
Robert L Edwards III
Patrick J Johnson