Spalding,
I looked at the clip and felt kind of sorry for Rudess; I guess that Kurzweil made him an offer he couldn't refuse to showcase the K 2600, but to me the clip would have been much better without all those annoying shouts in the background.
That said, I have seen that you already had your fair share of replies in the other thread, so I don't understand why you are re-opening this debate here. I will give you the same answer I have already given before: Rudess has no need of an arranger to showcase his talent because he can record on the fly whatever backing track he needs and for his purposes a workstation with top notch sounds like the Kronos is just perfect. The arranger, on the other hand, becomes a must for people (like me) who otherwise would need a week just to record a decent drum and bass track.