if deniro does, i think he should try really hard to get down the mannerisms and speech patterns like it seems he did for his original run as Don Vito. Considering how close a GF4 Vito would be to a GF1 Vito, i would really want not only Deniro, but makeup guys to make sure they got Brando in 72 to a T. if there were annoying descrepancies, id be dissappointed to see deniro in that role, but he is obviously the best man to do it.