I recently watched Norris's fight vs Tucker and I thought Norris won. Norris is not often talked about but considering he was very small in height he did well at Heavyweight beat Page, McCall, controversial decision loss to Tucker. Did very well against another Super Heavyweight in Golota whilst past his prime. And he certainly was an above average champion at Cruiserweight very good skillful fighter. I'm not the most knowledgeable on De Leon but Norris certainly looks better to me in regards to the eye test so I'd favour Norris aswell by decision.
DeLeon was one of those guys that would win fights you didn't think he'd win. And then fight an unspired fight his next time out. But this is the kind of bout he could win a decision and then pull a Greg Page & stink the place out in his next fight and lose. And lose badly. But the guy did look impressive in some of those wins of his. In a 3 fight series, neither goes 3-0.