Brad Dourif / Jason Miller
After checking out the awesome link that apollo86 posted (and thanks again):
https://www.youtube.com/watch?v=CVlj4T78vFg
I guess we're hearing some background info there that we've never heard before, right?
So Brad Dourif is saying that after filming all of his scenes, the studio didn't want him in the film after all - or rather, they really wanted Jason Miller - because of his obvious connection with the first film.
Then he makes it sound like he was going to be left out of the film entirely - were it not for the fact that Jason Miller wasn't able to completely take over the role (due to his alcoholism).
Is that how you're hearing what he says there? So that's why we ended up with both Jason Miller and Brad Dourif in the film (albeit with Dourif having to have his scenes re-filmed due to the changes in the set that were made after Jason Miller finally signed on, etc.)
I've seen Miller's Tale (if you're into Jason Miller, you should really check it out, it's great: http://www.imdb.com/title/tt1825074/combined) and I don't in any way doubt what Dourif said. To me it's quite clear Jason Miller went back to Scranton and more or less drank himself to death, but I just never realized at some point there may have been a plan to have Jason Miller in the film on his own and Brad Dourif never to be seen.
Pretty interesting stuff.
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Wait a minute... who am I here?