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Just playing devil's advocate here... (I'm not sure which model of the brain makes more sense to me just yet... they both seem to be very similar and have both pros and cons) but isn't it feasible that the consciousness can access everything in the unconscious, but that we just don't know how to do it yet. For example, when you are looking at the ballerina silhouette and she flips for the first time, you don't really have any control over when that first flip happens, but then you can start trying to flip her back and forth and you can get better at "seeing" her move in one way or another... couldn't there be other brain activities that are "unconscious" that we could learn to control consciously with some practice? Maybe like biofeedback things where people can control their heart rate and blood pressure etc...?

I don't know, and maybe there are only a subset of things that you can learn that is covered by the preconscious... but it's another thing to think about.