I must say this discussion has far exceeded my expectations.

I now see that it is important to be specific in how questions are worded. I am guilty of using "structure" as sort of a catch all term for anything like rockpiles, pallets, brushpiles, pvc trees, Sunil mounds, Condellominiums, Robbie the robots, etc but I like that we have differentiated them and I will try to use the specific term in the future. Also I was thinking of carrying capacity in terms of pounds of fish and not total pounds of all organisms. I do know that the type of cover, habitat, structure can greatly influence where that wieght will be held. Be it in young BG, large bass, gambushia or whatever.