thecolorsblend said:

Nothing has so far benefited ROTJ. Every single change has little or no redeeming value. The new closing music is okay but the glimpse of other planets makes me wonder if Luke tweeted the Emperor's death or something because those celebrations sure came together quickly. Hayden as Anakin's ghosts, Jedi Rocks, "No... Noooooooooo!", they're all retarded.

I think Lucas added Vader saying "No" to connect with the (rather hysterical) "No" from Episode III. But what Lucas doesn't realize is that you don't need Vader to say anything before he grabs he Emperor. When he grabs the Emperor, Vader is already silently saying "No."