As for the Emperor thing, I dunno man.
To me Lucas is a genious, he came up with the best story ever told.
So I like to think he knew esactly what he had in mind.
Thing is, Lucas has always said that Star Wars is meant to bee seen from the point of view of 3PO and R2. So he must of had the actors in mind to reprise all their roles when making the PT. I don't think anyone else could play 3PO aswel as Antony Daniels (Although I'm not super keen with what they done to 3PO in AOTC..The slapstick stuff that is...but thats just a minor niggle).
So yeah, Lucas had the all the actors who could reprise thier roles in the PT from the OT in mind!!
Oh I don't know, I'm just going on now...I don't even knoe WTF I'm on about anymore!!
