Robert DeNiro, who may be the greatest living actor, usually acts in a way which is very stone-faced, like Steve McQueen. For example, Steve McQueen, if you cut the sound, you don't know what he's acting really. He gives to the lines, to the text, something very special, and he's very good. He was a great actor. But, to do a silent movie, you have to have more expressive actors.
I think the writer is always the creator, because he's starting with nothing, but the actor comes in and gives flesh and blood.