I think Mungia will have trouble at the higher weights do to his lack of defense. If he tightens up that D he could be a real force.
I re-watched that Lemmy KO and he connected perfectly on a left hook with O'Sullivan throwing a jab and keeping his right hand down. The amazing thing for me though was Lemmy still basically got to his feet but the ref waved it off. It was a similar hook to what Lemmy landed on Stevens and he was put to sleep. Spike does have a good chin and Munguia isn't heavy handed. Bouncing a chinny Ali off the canvas and allowing him to see the 4th round doesn't mean you have world class power. I wouldn't be surprised to see this go the distance or into the later rounds (say 9+).