I think those are both extremes. I wouldn't really think of disability is an indicator of "health" either, since it can be genetic, illness-related, the result of an accident, etc. Around 15% of the global population is likely disabled, so nations with smaller populations may have a more limited pool of potential athletes. Of course, not every disabled person will want to be athlete either, some will prefer science, arts, politics, etc, so I'd imagine that impacts delegation sizes as well. I think there's also a funding and accessibility element to representation as well, so it's a complex topic.