Agreed. You're not going to break into the business and win matches right from the get-go. Everyone save Zeus, Mr. T, Lawrence Taylor, Jay Leno, Karl Malone, and Dennis Rodman were jobbers at some point.
Hey, those guys clearly paid their dues... They each jobbed in their first match.
Wasn't Hogan squashing guys in handicap matches shortly after his debut? And WCW picked Goldberg up off the street and turned him into an instant ME, he didn't do any jobs. Except for Piper 6 months before his "official" debut.
I think Greg Valentine can be called a one time true main eventer that went on to be a jobber.