Chapo by KO. For two reasons. 1. Lightweight wasn't TC's optimal weight. He's better at 140. And 2. TC is no defensive genius in there. When Rosario lands on Crawford, it's a WORLD of difference than Gamboa landing on him.
I do agree Chapo knocks him out. I think Crawford has the tools to beat him. However, to Crawford's detriment against an opponent like Rosario, he does like to get into slugging matches a bit much and I think Rosario's reputation would fire him up to try to PROVE that he could bang with him and that would be his undoing. Chapo TKO 5.