Wild Force - Taming the Zords Problem

So I was watching Wild Force on Netflix... because it's one of my favorite seasons of Power Rangers, and it's the first of my Disney Era Power Ranger Marathon. And then the episode "Taming the Zords" came up, where the rangers manages to somehow form the Wild Force, Konga, and Isis Megazords all at the same time, not to mention the Predator Megazord. How is this possible if only the Bison and Rhino Zords act as the legs? Are there multiple copies of the zords? And if so, why didn't the rangers do that before or after?