If Cotto couldn't knock out Malignaggi in a tiny ring, I don't see N'dou being able to do it. I think Malignaggi dances circles around N'dou all night, frustrating the hell outta him and winning a UD, albeit with some tense moments when N'dou catches him.
Although, anyone who looks at my predictions in Killersheep's book will know I'm not exactly clairvoyant about these things...