I agree. Duff didn't have to say the positive stuff about Scott that he did as far as being a frontman etc. I even thought Scott was pretty "nice" about Slash in his interview with Stern for the most. However, I do think it was ridiculously childish for the way they released the info about Scott not being in the band any longer. Granted, it may have been retaliation for Scott anouncing that it was the last VR tour.
I am sure Scott always felt like the outsider especially when things weren't going well considering the history the other guys have together.
As far as the voices during the show, I have no doubt it was Sorum. I have the NYE VR show downloaded and I can hear him singing way too much on my ipod. My wife was even like-what the hell is that, I said that is Sorum and it is terrible.