I really can't say what the whole intention was, other than to create an artificial playground full of trophy bass. I mean, the FWC here in Florida was quite aware what they were doing. When they were first making that place, they carved it out, some of the workers carving out big words of their own name "John", another that spelled out "FLA", playing around with the machinery and having a good 'ol time before they flooded it.
I've often wondered myself just how many shiners can be taken from these small confined places without totally disrupting the chain of life for the bass. I'd like to think that the same thing happened next door at the Stickmash. That place was fished out, literally. From experience, you'd think with this new place (Headwaters) that the FWC would impose stricter guidelines other than a 25mph speed limit and a sunrise to sunset time frame. Catch and release is about all they did afterwards. I reckon they did the best they could. Perhaps, later, with the diminishing baitfish population, they may in fact come to terms with the biological impacts and enact stricter guidelines for that. When these places get really crowded and off-the-wall, bad things can happen which get the attention of the authorities, thus ruining it for everyone. That's pretty much how it happens down here in Florida. Hopefully it doesn't come to that. Hopefully folks remain responsible. Hopefully!
As far as those cages go, my guess is most likely for bass, held there only to be retrieved later on for CPR tournaments. Only reason I say that is because I've seen them many places before, same sorta thing. Poachers would just take the fish and then split. Besides, Headwaters is closed at night and there's no airboats allowed. So anything going on happens in daylight. There's not a large presence of FWC officers patrolling that place, so if someone wants to get away with something, they pretty much can.