Mrebo said:

In some thread was posted the link about the Godfather restoration. What is bugging me now is why didn't they just scan and use the technicolor print (rather than go through all the work with the damaged negative)?

As there is some hope out there for using technicolor of Star Wars, I'm wondering what deficiency if any there is in relying on such a print?

Because it's the highest quality. There would be nothing wrong with scanning a Technicolor print, but it's still two or three whole generations removed from the negative. Negatives can be saved, so it's better to restore the original negative rather than making a new one from a copy of a copy of a copy.