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yup, what they said, basically. You want about one in every two-three feathers on the main body tipped in a v-shaped white mark, one in every three on the head a white tipped feather, and a one in four on the hackles in rooster to be what...something like a minimum length of 1/3 an inch tipped in white. You want white v-marks on every single primary and secondary wing feathers, and a white "frosting" on the fluff feathers on the backs of the thighs and below the vents.
So, depending on how much of the tail feathers are white, it wouldn't necessarily be a direct defect.
hope this helped at least a little bit!
-Mottie