Are you implying that these are just like lfs bettas? If not, I see no contradiction
no I mean by the fact that the all white fish has a fault in it's genes causing it to be all white and if you bred from it the offspring would be quite different to each other some might be red others would be white with a patch of red and all breeders should be trying for the most pure strain of betta possible not ramdomly coloured offspring
I suppose if you feel the idea of breeding siblings into the ground to get a pure strain is what's "supposed" to be done- then we see things very differently. And you've obviously missed the point of a marble. There is no better choice in the world for that male than that particular female, imo. And she has no fault, she's a cellophane. You must be of the opinion that getting a strain happens in what,the first,the second generation? Do tell me more. Please show me an example of a "pure strain" that didn't have oddities in it for the first few generations.
Thanks for the comments everyone else. I can already foresee the death of this topic.