If it is recessive, codominant or incomplete dominant the numerical patterns would strongly emerge whether breeding non-visuals together within a closed gene pool, or when breeding non-visuals that resulted from an outcross.
Conversely, if it was a polymorphic trait the number of visuals produced would be very small - either with inbreeding or outcrossing till you managed to line up all the traits.

"So comparing different percentages may not be of value. not in small numbers"

Frank's point is very true.
But it is precisely because you need large numbers for statistics to be meaningful, that you probably won't prove out the trait more effectively with outcrossing as opposed to inbreeding - UNLESS there is a significant numerical difference between the two approaches.

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