John Rhys Plumlee wants to tamp down on the talk that he may switch positions now that the Steelers signed him as an undrafted free agent. He’s a quarterback. True, Plumlee can maneuver like a tailback. After all, he gained more than 1,000 yards running against SEC defenses during his freshman season at Ole Miss. He also can run routes like a receiver. But he sees himself as a quarterback, first and foremost. He finished his career at Central Florida where he could throw and run. Plumlee gave his thoughts on a potential position switch this week during an interview with Steelers Takeaways. “I …