The problem is that if a bird has the gene, he/she will pass it to 50% of the offspring, but you may never see a dwarf if that bird passes only one gene and never pairs with a mate who has one. The carriers will look no different than a regular bird, usually. Cetawin's girl who has a double gene is a big chunky thing.
Honestly, if there are dwarfs coming from the line, maybe, but if there have been none produced by those particular birds, that they just came from lines that had the gene, I'd go ahead and get them. That's just me, though. Breeding always yields culls and the dwarfs would just be culls. Since you can't see the gene, it's hard to know which bird carries it, like all hidden genes.
Honestly, if there are dwarfs coming from the line, maybe, but if there have been none produced by those particular birds, that they just came from lines that had the gene, I'd go ahead and get them. That's just me, though. Breeding always yields culls and the dwarfs would just be culls. Since you can't see the gene, it's hard to know which bird carries it, like all hidden genes.
