By Jarrod Castillo Parris Campbell believed new Philadelphia Eagles star Saquon Barkley will become the best running back in the NFL. The Eagles wideout spilled the beans to the Philadelphia Inquirer, claiming that Barkley is gunning for Christian McCaffrey’s crown as the NFL’s top running back. McCaffrey of the San Francisco 49ers is the league’s reigning Offensive Player of the Year. Campbell, who recently started training with Barkley, was full of praise for his new teammate’s prowess on the field, suggesting that Barkley is set to shake up the league and challenge McCaffrey. Barkley recent…