skyjedi2005 said:

But Marquand was dead and he had also been given final cut by Lucas but had his film changed posthumously by the director of the first film also known as star wars.

Actually, if I remember correctly, J.W. Rinzler's excellent Making of RotJ tells a slightly different story. Marquand and his editor did submit a cut to Lucas, but he had to do so before all of the special effects were done, and Lucas was not too thrilled with Marquand's take. Lucas basically re-did the whole thing from scratch and that is what was released to theaters in 1983. (Again, I'm going from memory so I could be wrong!)

Still, that's not to say I don't agree with your point; I do. But if Lucas did the edit back then, maybe he feels he has some minor grounds to "update" that edit later. That's debatable. I just wish he hadn't! :P