2 breve creatures?

I've learnt a little since I got breve. When using the steve code I have managed to make creatures evolve to move through zero gravity, up hills, on balls, over obstacles, terrain and ramps. I can even spawn 2 or more creatures.

The problems I'm having are that whenever I spawn 2 creatures:

1) it's a replica of the first creature without its own genetic strain.
2) No matter what I do I can't seem to get them to seperate....they start in exactly the same position and usually end up bashing each other.

Ideally I'd like to have 2 separate brevecreatures fighting over a ball and whoever is closer to the ball at the end wins.

Also how would I go about setting up the fitness so that the get-fitness value was the distance between ball and creature?