Ohio State does not produce NFL calibre QB's, though many of their QB's are highly touted to be able to excel at the pro level.
Buckeyes best pro QB ever was the undrafted Mike Tomczak. He had some moments ('85-'99), starting 78 games, including 5 playoff games in that 15 yr. span.
That he's the best QB ever from a long standing elite program like OSU, ain't saying much for their ability to develop NFL QB's there.
Odds aren't in Fields favor to buck that trend.