Even though every fights are different and styles make fights, Valero would have knocked Burns out in 6 rounds or less, no doubt about it.. Valero would have killed BUrn's B level ass..
Crawford would get countered over his arm punch jabs repeatedly. If Crawford's chin holds up, the judges might give him a UD based on his activity and defense, but Valero will be landing the MUCH harder shots and beating Crawford up even if he loses on the scorecards.
Beltran didn't seem to have much trouble at times countering Crawford. Valero is a lot more explosive than Beltran. I think Valero was unpolished, but he had a lot of potential. I think Valero would counter Crawford often and put Crawford into either a defensive shell or make Crawford have to fight him off, which would mainly involve him throwing a whole heap of arm punches. If Crawford can throw enough arm punches, he may win a decision, but Valero will land the hard shots.