You know why this keeps coming up? Because PBF keeps pointing to his undefeated record as proof that he's great. There's two objections to this claim: 1. He's fought no real threats at 147 2. He's arguably not undefeated. And this is where Castillo comes in.
I gave Castillo 7 clear rounds long before I hated Floyd. I used to love watching him fight back then, and this was before he became quite so loathesome, or at least his loathesomeness hadn't had enough time to really brew and become as detestable as now. I'm honestly surprised you think Floyd won, I see that first fight almost as clear for Castillo as the second one is for Floyd. I'll watch it a 3rd time and see if I have the same opinion.