They have tools to zone, but to call them "ridiculous" is a stretch. "Ridiculous" would be Zod zoning, MMH zoning, Sinestro zoning. Are you really putting Harley or Supergirl in this category of zoning??? They have supportive zoning, but nothing outrageous.
But for sake of argument, let's say all 9 characters you listed are zoners. This is assuming none turn out like Balanced Kenshi when we play, and is in comparison to 20 other offensive characters on release who will likely have strong offensive options and a nearly Safe universal MB Roll. So even if your statement was 100% true, there would still be significantly less zoners in the game when counting the entire 29-30 man roster.