Devon Johnson's move from backup tight end to starting running back in the preseason was meant to protect prolific quarterback Rakeem Cato. The junior rushed for a school-record 272 yards and four touchdowns to lead No. 23 Marshall to a 35-16 win over Florida Atlantic on Saturday. ''I knew he was a really good football player, but for me to say we're going to move him to tailback and get the production that we've gotten out of him, I didn't think that,'' said Marshall coach Doc Holliday.