the dialogue in the original was great, it didn't need to be spelled out for the morons, I was 10 when i first saw Empire on it's first release and I managed to work it out, if Empire is supposedly set 3 years after A New Hope, then the all-seeing ,all-knowing Emperor is a little slow in catching on , I assumed he'd found about Skywalker from being able to read Vaders mind/feelings anyway, long after Vader had worked it out for himself.