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How much energy can you get out of something that is only slightly more or less buoyant than the surrounding water. It's like a balloon that has a pencils worth of positive buoyancy. It'll go up pretty high into the atmosphere, but you'll get very little energy generation from it.
It'll probably go on for a very long time underwater, because you don't need much energy to rise or fall if you're straddling the line of neutral buoyancy. It would rise slowly and slowly to turn a generator. The height it ascends or descends may be large, but not a reflection on how much power it could generate. If you used more energy for more positive lift, you'd fight against the drag of water going up.
It's like the drinking birds. They'll bob up and down forever, but there just running off of the heat differential. There's waste somewhere, and eventually it'll stop.
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I try to be helpful. I'm not an expert.
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