@Emily I wish I could shimmy your post multiple times.
I really don't agree with the above poster that said the XS teams should not be called World Champions. That's like saying that the winner of large senior shouldn't be called World Champions because they had too many athletes to compete in small senior.
No large gyms are not going to dismantle their large teams to compete XS but when you have a huge amount of level 5 athletes to chose from it gives you a lot more leeway to create strong teams. I absolutely believe if CA/TG/Cali decided to field an XS team next year, they would decimate any of the current gyms that competed in those divisions because their "worst" level 5 athletes may still be better than the "best" athletes at the small gym.