if u use 100% dead rocks, it will ultimately remain dead.
dead rock can only become liverock in the presence of other live rocks. that way, the "live" things can spread and make home in the dead rock.
also, the variety of microfauna and other wonderful things that grow on your dead rocks will be determined by your live ones. more live rock = a greater number of microfauna.
fully cured liverocks free of pests are one of the best things to have in an aquarium. good biological filtration, abundant live forms and great hiding places for your fishes.