If Diaz doesn't find it too hard making weight he will be a better fighter at 160 lbs. He might be bigger than Gomi. If that's the case he could take him down and submit him, it's been done before. Or he might be too tall for Gomi's boxing to be effective. If that's the case he could knock him out, like he did Lawler. This should be very interesting, provided Diaz is comfortable at 160lbs.