This approach is way more effective and simpler than using the Boole :)
I was trying to make the clones appear from the center to then fill up the shape and found the following issues:
1. With an animated .mov as a texture in the shader object, it works alright but the clones twitch in rotation before its final position.
2.Using a Step effector to control the visibility, the problem with this is that some of the clones can't be modified and I would need to use around 2-4 step effectors for it to work. This is using the step effector in combination with the shader.