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Its not the Dom Whtie that is the danger in the other White breeds like White Rocks. It is becuase they are Recessive white which means they are maskin another color under the white and without knowing the genetic history of the line, there is no way to know what is being masked so it may be masking a Silver color which will work but if not, then it wont work. So they are unpredictable and that is why it is best to stay away from Rec White breeds when making sexlinks.
But RIW are what I have used and they arent Recessive white, They carry both Silver and Dominant white. The Silver is what allows them to make the Sexlinks, the Dom White is what makes the white tails in the red hens.