[AlexanderHowl]

No, not really. If the bunnies are not under the control of a central intelligence, there is no reason for Diffuse with Swarm. Greater Transform Body just makes the primary bunny while Greater Transform Mind changes a human mind into a bunny mind. The rest of the bunnies are simply a special effect, they fade away at the end of the duration of the ritual.

Now, if the transformed individual had control over all of the bunnies, I agree that it would be appropriate, but that is not the case here. The idea is to transform the target into a defenseless woodland creature without violating the conservation of mass. Of course, having an enemy wake up a week later, with the memory of their bunny experience to traumatize them, is quite satisfying.