You have the original colony, lets all say with well rounded equal stats. The seedlings scout the asteroid, find out what kind of resources it has, and then chooses the best way to spend those resources in the three stat areas. 15 of them then reconfigure themselves into a Dyson tree that absorbs the resources and produces new seedlings to best utilize the asteroids resources. Then those seedlings navigate to a different planet, scout the resources, plant a new tree, and start production there.
I know you didn't really mention resources or anything, but I figured that would be the easiest way to explain the stats of the seedlings being generated because of the asteroid.
This is pretty much how the game works now. The original design has explicit resources in the asteroid, minerals, water, and metal alloys, and this is what causes the seedling diversity across the different asteroids. The tree roots in the original design would actually burrow to pockets of resources, which explains their wiggly trajectory. The resulting paths were to function as playable "dungeons" the player could enter and explore. Due to the original competition time limits however we dropped this idea but the trees still act accordingly. :-)