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The steps in simple terms are;
1. Pure RAW - a monochrome (RGB channels intact) image with the color filter array intact
2. Calibration - single channel - less memory
3. DeBayer - interpolate the RGB pixel values to create a color image
4. Register
5. Integrate
A monochrome image does not necessarily imply no color information, but I guess that is understood.
Calibration prior to calibration is possible but not a good idea. Debayering without median reduction introduces color artefacts, while three channels consumes lots of memory.
Furthermore, when using the traditional PI image reduction method (dark scaling) keep in mind it may produce poor results with some DSLR RAW data sets. A different approach is necessary. Proper acquisition is the key.
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