Zach Frazier can’t help his toughness. It’s embedded in his soul. The Steelers rookie loved Pittsburgh’s physical style of play when he was growing up in West Virginia. Plus, he always wears the number 54 in honor of another player known for his tenacity. But yikes. The Steelers newest offensive lineman wears his number because of a Dallas Cowboy. He explained that his parents were big fans of the Miami Dolphins. And they loved long-time Dolphins linebacker Zach Thomas. He’s the Texas Tech star who finished his career back home in Texas with the Cowboys. Last August, former Cowboys coach Jimmy…