Preta path absorbs all ninjutsus. If Madara really had awakened the rennigan during his lifetime then he cn use all the 6paths power though he hasnt. Nd what makes u thnk he cannot. Naruto has no ans. to heavenly tec. like the meteore tec. nd ultimate Susanoo. Rasenshuriken nd TBB would nt be enough. He still hasnt surpassed legendary Madara.