It would be a great fight. Boom Boom was very strong, not easy to slug with. Boom Boom beat rugged Mexican Jose Luis Ramirez, but Castillo had a little better boxing skill than Ramirez, but similar power and defense. I think Castillo would outpoint or stop Boom Boom on cuts late.
I think Ray has just enough to outpoint Jose, but it would probably go the split decision route.If it was fifteen, I say Ray would get a unanimous verdict.