Pvz 2 Veteran Zombies In Endless

In pvz 2 evrey world has an endless zone where you fight endless levels of zombies. But there are no veteran zombies. Veteran zombies are strong and unique zombies that only show up in arena, penny's pursuit, and the quests of hard world levels. I think they should be on later levels of endless to give the player more of a challenge and another chance to see them.