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It was suggested that I picked birds that complimented each other. In other words, definitely don't put a brother and sister together that have the same fault as it will almost surely be reproduced, however, if you have a brother and sister where one could use some improvement on size or type, for example, and the other has that in spades, but perhaps, a "funky" comb or some other off detail, give it a try. If it works, you will increase the numbers, and regardless,you will very likely flush out recessives in the line and other issues that might show up down the road.
This opinion is based on starting with stock that is not "junk". Maybe a detail off here and there but basically, good birds from an established line. (Although, one man's junk can be another man's treasure .... )