Great job explaining it. So it's kind of like a (human) family of 8 children all growing up in the same environment yet some are malnourished, one is over weight, while the others are all "normal" despite being in the same healthy environment with access to the same needs.I've walked across old coral reef rock like that. If I didn't have shoes , it would shed my feet.
Amazing they can navigate that rough terrain.
The pyramiding of native ALDABRAN is observable , though most are not. I would have to think it involves much the same factors as we see in captive; periods of relative dehydration.
I didn't explain this very well. But I hope it makes some sense.