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The ball will rise and fall with the top float. There is no change in buoyancy throughout the cycle, other than the depth of water on the lower float, which is somewhat insignificant. There is no mechanism to pop the ball off, as the water rises to the top float the top float will slowly lift the ball and let water drain, this will either suck the ball back down or allow a balance to be found (depending on the pump size).
The float in a toilet has controls the fill valve, not the flapper. The flush handle acts as a lever to pull the float open far enough so that it pivots past its negative buoyancy point.
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