I don't see any issue in taking the stance to stay away from the spider gene even if you have never owned one. There is a huge difference between a random defect and a known disfunction attached to a phenotype. To reach there own but I plan on staying as far away from the spider gene as possible. There is an old school breeder near me that has even stated that spider sibs can get the wobble. He claims to have proof and offered to show me some animals, but I have yet to make it down there. He also claims to have been on the forefront of discovering the cg/banana sex link, but who knows.