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You're right, breeding brother and sister usually isn't a good idea. Just buy some some chicks or a juvie cock from a different breeder.
I think that all depends on how tightly the line has already been bred. each line has its advantages and disadvantages especially when they are still such a work in progress. Line breeding often resolves some issues but will not resolve all the issues. We have had stock from Paul's, Superior, Foley's and one other. Each was breed in thier pens for the first year , comb issues that existed withing one line in particular resulted in 100% cull. Then selctive line crosses to achieve specific goals based on hwat each line had to offer then carefull selection and F1xF1 matings from each line cross and selection for the traits we wanted to retain such as color, type, size, etc. Then selective matings from the f2 offspring of teh line crosses and then breeding the resulting cockrells and pullets and selecting for the desired traits. Line breeding solves problems when carefull selection takes place so long as teh traits you want to achieve exist within the breeder birds.