ALL snakes with the spider gene have the wobble, or will develop the wobble in the future, yes. I swear there was another thread about this, people discussing when their spider-gene ball developed wobble, how severe it was, and whether it was that way from hatchling... let me see if I can find it.
And yes, the wobble is a neurological disorder associated with the spider gene. If you breed a pastel to a spider, and you get:
Spider, Pastel, Normal, Bumblebee
Only the spider and bumblebee will have the disorder.
here it is: http://ball-pythons.net/forums/showt...ghlight=wobble