My guess is that consciousness is not primarily due to brain structure. Imagine brain structure as an ensemble of instruments, maybe all the stringed instruments of an orchestra, and a full section of various types of percussion instruments, and maybe some horns and wind instruments too. The real fun doesn't happen until people pick up those instruments and play.

Consider that a brain can have around 100 billion neurons. And imagine conservatively that each neuron can be connected to 1000 other neurons.

So the number of possible structures of a brain if we calculate very crudely is the number of options per neuron raised to the power of the number of neurons. Each neuron selects up to 1000 connections, so that is the sum of 100 billion choose i as i goes from 1 to 1000. Note that this is less than 2 to the 100 billionth power, since some options of extreme hyper connectivity are assumed not to occur. Then we raise that sum to the 100 billionth power since these options are selected at each neuron. The options don't overlap since the axons leaving the cell are different from the dendrites coming towards the cell. We call this number M, which is less than 2 to the hundred billion to the hundred billion, which is 2 to the 10 septillion using the liberal estimate of assuming each neuron has 1000 connections.

Now consider the number of possible people, where we define a person as a changing consciousness by considering the possible combinations of connections that have active signal flow. Then the number of possible consciousnesses in a given brain structure is roughly 2 to the number of connections in a brain, which we say on average is roughly 2 to the (500*100 billion). We call this number N. To get a rough estimate of the number of possible consciousnesses in any possible brain, we multiply N by M. N*M is far greater than M, meaning consciousness has more possibilities than brain structure.

One possible conclusion is that the possible complexity due to the signal activity in a brain is far greater than the possible complexity due to the structure of the carriers of those signals, the brain itself. We can also consider that the number of possible brain structures is more than the number of possible consciousnesses in a given brain structure. This leads me to the idea that the differences between different people is possibly larger than a single person’s power to have different thoughts within a given brain. That could mean that in a way we all live in different worlds, or that the differences in our perceptions are bigger than our power of thought to understand what we perceive. A single person's most complex thought may always be small compared to the achievement of nature in the diversity that exists in our differences.

We can also ask if sleeping activity, even with few signals active, could still carry more information than the structure? Meaning that activity at night can still be more important to consciousness than structure. Maybe the brilliance of day time consciousness makes night time seem quiet in comparison. It may therefore still be possible that the consciousness at night resides in the signal flow more than in the structure.