I believe the story goes all the RB/FB's were walking into a meeting and Babe was sitting there and says "look at all those cheetahs and that one great big Moose."
"I could've done a $2 billion takeover (in another industry) with the capital I put in the Dallas Cowboys," he says. "I really could see (myself as) the idiot who had something real good, who blew it all to coach the Cowboys. I just knew that was going to be my legacy." Jerry Jones 9/14/2012
Answer: Babe Laufenberg (1989 to 1990), who spotted the big and muscular Johnston walking out of a meeting surrounded by several smaller and slighter Cowboys' running backs.