Yeah, the business of who can bend and who doesn't is kind of complicated. I don't get it all, myself. I just know there hasn't been an air nomad that couldn't airbend, while the other nations which are larger have more sizeable populations of non-benders. Like trusty old Sokka. Yet among my three children, only my youngest is an Airbender. The others are a non-bender and a- the same type of bender as his mother.