yeah, those are all good gyms, but where the heck is Cheer Athletics? they're undeniably one of the all-time best. and they ARE the biggest. out of the "top 3 powerhouses" you listed, GymTyme is the only one i'd consider an actual powerhouse. as for top 3 i'd have to say Cheer Athletics, Cheer Extreme and Stingray All-Stars.
and i'm surprised nobody said Spirit of Texas...
or Twist and Shout?
World Cup?
Pro Spirit?
Georgia All-Stars?
California All-Stars?