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Exactly. The heat should be drying the eggs out to create an air sac for the chick. That's the reason for monitoring the humidity. If the humidity is too high the eggs don't lose enough water and the chicks drown. If the humidity is too low the eggs dry out too much and you end up with small, weak, if not dead, chicks.
The incubator has to have an air exchange with the outside to give the embryos oxygen and to release the moisture. Desiccant will only work in a sealed container. Putting dessicant in an incubator will only cause it to become saturated quickly and add moisture back to the air if the humidity does drop, just like a sponge.